1/* $Id: tif_luv.c,v 1.40 2015-06-21 01:09:09 bfriesen Exp $ */ 2 3/* 4 * Copyright (c) 1997 Greg Ward Larson 5 * Copyright (c) 1997 Silicon Graphics, Inc. 6 * 7 * Permission to use, copy, modify, distribute, and sell this software and 8 * its documentation for any purpose is hereby granted without fee, provided 9 * that (i) the above copyright notices and this permission notice appear in 10 * all copies of the software and related documentation, and (ii) the names of 11 * Sam Leffler, Greg Larson and Silicon Graphics may not be used in any 12 * advertising or publicity relating to the software without the specific, 13 * prior written permission of Sam Leffler, Greg Larson and Silicon Graphics. 14 * 15 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, 16 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY 17 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. 18 * 19 * IN NO EVENT SHALL SAM LEFFLER, GREG LARSON OR SILICON GRAPHICS BE LIABLE 20 * FOR ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, 21 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, 22 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF 23 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 24 * OF THIS SOFTWARE. 25 */ 26 27#include "tiffiop.h" 28#ifdef LOGLUV_SUPPORT 29 30/* 31 * TIFF Library. 32 * LogLuv compression support for high dynamic range images. 33 * 34 * Contributed by Greg Larson. 35 * 36 * LogLuv image support uses the TIFF library to store 16 or 10-bit 37 * log luminance values with 8 bits each of u and v or a 14-bit index. 38 * 39 * The codec can take as input and produce as output 32-bit IEEE float values 40 * as well as 16-bit integer values. A 16-bit luminance is interpreted 41 * as a sign bit followed by a 15-bit integer that is converted 42 * to and from a linear magnitude using the transformation: 43 * 44 * L = 2^( (Le+.5)/256 - 64 ) # real from 15-bit 45 * 46 * Le = floor( 256*(log2(L) + 64) ) # 15-bit from real 47 * 48 * The actual conversion to world luminance units in candelas per sq. meter 49 * requires an additional multiplier, which is stored in the TIFFTAG_STONITS. 50 * This value is usually set such that a reasonable exposure comes from 51 * clamping decoded luminances above 1 to 1 in the displayed image. 52 * 53 * The 16-bit values for u and v may be converted to real values by dividing 54 * each by 32768. (This allows for negative values, which aren't useful as 55 * far as we know, but are left in case of future improvements in human 56 * color vision.) 57 * 58 * Conversion from (u,v), which is actually the CIE (u',v') system for 59 * you color scientists, is accomplished by the following transformation: 60 * 61 * u = 4*x / (-2*x + 12*y + 3) 62 * v = 9*y / (-2*x + 12*y + 3) 63 * 64 * x = 9*u / (6*u - 16*v + 12) 65 * y = 4*v / (6*u - 16*v + 12) 66 * 67 * This process is greatly simplified by passing 32-bit IEEE floats 68 * for each of three CIE XYZ coordinates. The codec then takes care 69 * of conversion to and from LogLuv, though the application is still 70 * responsible for interpreting the TIFFTAG_STONITS calibration factor. 71 * 72 * By definition, a CIE XYZ vector of [1 1 1] corresponds to a neutral white 73 * point of (x,y)=(1/3,1/3). However, most color systems assume some other 74 * white point, such as D65, and an absolute color conversion to XYZ then 75 * to another color space with a different white point may introduce an 76 * unwanted color cast to the image. It is often desirable, therefore, to 77 * perform a white point conversion that maps the input white to [1 1 1] 78 * in XYZ, then record the original white point using the TIFFTAG_WHITEPOINT 79 * tag value. A decoder that demands absolute color calibration may use 80 * this white point tag to get back the original colors, but usually it 81 * will be ignored and the new white point will be used instead that 82 * matches the output color space. 83 * 84 * Pixel information is compressed into one of two basic encodings, depending 85 * on the setting of the compression tag, which is one of COMPRESSION_SGILOG 86 * or COMPRESSION_SGILOG24. For COMPRESSION_SGILOG, greyscale data is 87 * stored as: 88 * 89 * 1 15 90 * |-+---------------| 91 * 92 * COMPRESSION_SGILOG color data is stored as: 93 * 94 * 1 15 8 8 95 * |-+---------------|--------+--------| 96 * S Le ue ve 97 * 98 * For the 24-bit COMPRESSION_SGILOG24 color format, the data is stored as: 99 * 100 * 10 14 101 * |----------|--------------| 102 * Le' Ce 103 * 104 * There is no sign bit in the 24-bit case, and the (u,v) chromaticity is 105 * encoded as an index for optimal color resolution. The 10 log bits are 106 * defined by the following conversions: 107 * 108 * L = 2^((Le'+.5)/64 - 12) # real from 10-bit 109 * 110 * Le' = floor( 64*(log2(L) + 12) ) # 10-bit from real 111 * 112 * The 10 bits of the smaller format may be converted into the 15 bits of 113 * the larger format by multiplying by 4 and adding 13314. Obviously, 114 * a smaller range of magnitudes is covered (about 5 orders of magnitude 115 * instead of 38), and the lack of a sign bit means that negative luminances 116 * are not allowed. (Well, they aren't allowed in the real world, either, 117 * but they are useful for certain types of image processing.) 118 * 119 * The desired user format is controlled by the setting the internal 120 * pseudo tag TIFFTAG_SGILOGDATAFMT to one of: 121 * SGILOGDATAFMT_FLOAT = IEEE 32-bit float XYZ values 122 * SGILOGDATAFMT_16BIT = 16-bit integer encodings of logL, u and v 123 * Raw data i/o is also possible using: 124 * SGILOGDATAFMT_RAW = 32-bit unsigned integer with encoded pixel 125 * In addition, the following decoding is provided for ease of display: 126 * SGILOGDATAFMT_8BIT = 8-bit default RGB gamma-corrected values 127 * 128 * For grayscale images, we provide the following data formats: 129 * SGILOGDATAFMT_FLOAT = IEEE 32-bit float Y values 130 * SGILOGDATAFMT_16BIT = 16-bit integer w/ encoded luminance 131 * SGILOGDATAFMT_8BIT = 8-bit gray monitor values 132 * 133 * Note that the COMPRESSION_SGILOG applies a simple run-length encoding 134 * scheme by separating the logL, u and v bytes for each row and applying 135 * a PackBits type of compression. Since the 24-bit encoding is not 136 * adaptive, the 32-bit color format takes less space in many cases. 137 * 138 * Further control is provided over the conversion from higher-resolution 139 * formats to final encoded values through the pseudo tag 140 * TIFFTAG_SGILOGENCODE: 141 * SGILOGENCODE_NODITHER = do not dither encoded values 142 * SGILOGENCODE_RANDITHER = apply random dithering during encoding 143 * 144 * The default value of this tag is SGILOGENCODE_NODITHER for 145 * COMPRESSION_SGILOG to maximize run-length encoding and 146 * SGILOGENCODE_RANDITHER for COMPRESSION_SGILOG24 to turn 147 * quantization errors into noise. 148 */ 149 150#include <stdio.h> 151#include <stdlib.h> 152#include <math.h> 153 154/* 155 * State block for each open TIFF 156 * file using LogLuv compression/decompression. 157 */ 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 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 */ 183static int 184LogL16Decode(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 */ 252static int 253LogLuvDecode24(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 */ 305static int 306LogLuvDecode32(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 */ 377static int 378LogLuvDecodeStrip(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) 379{ 380 tmsize_t rowlen = TIFFScanlineSize(tif); 381 382 if (rowlen == 0) 383 return 0; 384 385 assert(cc%rowlen == 0); 386 while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s)) 387 bp += rowlen, cc -= rowlen; 388 return (cc == 0); 389} 390 391/* 392 * Decode a tile of pixels. We break it into rows to 393 * maintain synchrony with the encode algorithm, which 394 * is row by row. 395 */ 396static int 397LogLuvDecodeTile(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) 398{ 399 tmsize_t rowlen = TIFFTileRowSize(tif); 400 401 if (rowlen == 0) 402 return 0; 403 404 assert(cc%rowlen == 0); 405 while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s)) 406 bp += rowlen, cc -= rowlen; 407 return (cc == 0); 408} 409 410/* 411 * Encode a row of 16-bit pixels. 412 */ 413static int 414LogL16Encode(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) 415{ 416 LogLuvState* sp = EncoderState(tif); 417 int shft; 418 tmsize_t i; 419 tmsize_t j; 420 tmsize_t npixels; 421 uint8* op; 422 int16* tp; 423 int16 b; 424 tmsize_t occ; 425 int rc=0, mask; 426 tmsize_t beg; 427 428 assert(s == 0); 429 assert(sp != NULL); 430 npixels = cc / sp->pixel_size; 431 432 if (sp->user_datafmt == SGILOGDATAFMT_16BIT) 433 tp = (int16*) bp; 434 else { 435 tp = (int16*) sp->tbuf; 436 assert(sp->tbuflen >= npixels); 437 (*sp->tfunc)(sp, bp, npixels); 438 } 439 /* compress each byte string */ 440 op = tif->tif_rawcp; 441 occ = tif->tif_rawdatasize - tif->tif_rawcc; 442 for (shft = 2*8; (shft -= 8) >= 0; ) 443 for (i = 0; i < npixels; i += rc) { 444 if (occ < 4) { 445 tif->tif_rawcp = op; 446 tif->tif_rawcc = tif->tif_rawdatasize - occ; 447 if (!TIFFFlushData1(tif)) 448 return (-1); 449 op = tif->tif_rawcp; 450 occ = tif->tif_rawdatasize - tif->tif_rawcc; 451 } 452 mask = 0xff << shft; /* find next run */ 453 for (beg = i; beg < npixels; beg += rc) { 454 b = (int16) (tp[beg] & mask); 455 rc = 1; 456 while (rc < 127+2 && beg+rc < npixels && 457 (tp[beg+rc] & mask) == b) 458 rc++; 459 if (rc >= MINRUN) 460 break; /* long enough */ 461 } 462 if (beg-i > 1 && beg-i < MINRUN) { 463 b = (int16) (tp[i] & mask);/*check short run */ 464 j = i+1; 465 while ((tp[j++] & mask) == b) 466 if (j == beg) { 467 *op++ = (uint8)(128-2+j-i); 468 *op++ = (uint8)(b >> shft); 469 occ -= 2; 470 i = beg; 471 break; 472 } 473 } 474 while (i < beg) { /* write out non-run */ 475 if ((j = beg-i) > 127) j = 127; 476 if (occ < j+3) { 477 tif->tif_rawcp = op; 478 tif->tif_rawcc = tif->tif_rawdatasize - occ; 479 if (!TIFFFlushData1(tif)) 480 return (-1); 481 op = tif->tif_rawcp; 482 occ = tif->tif_rawdatasize - tif->tif_rawcc; 483 } 484 *op++ = (uint8) j; occ--; 485 while (j--) { 486 *op++ = (uint8) (tp[i++] >> shft & 0xff); 487 occ--; 488 } 489 } 490 if (rc >= MINRUN) { /* write out run */ 491 *op++ = (uint8) (128-2+rc); 492 *op++ = (uint8) (tp[beg] >> shft & 0xff); 493 occ -= 2; 494 } else 495 rc = 0; 496 } 497 tif->tif_rawcp = op; 498 tif->tif_rawcc = tif->tif_rawdatasize - occ; 499 500 return (1); 501} 502 503/* 504 * Encode a row of 24-bit pixels. 505 */ 506static int 507LogLuvEncode24(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) 508{ 509 LogLuvState* sp = EncoderState(tif); 510 tmsize_t i; 511 tmsize_t npixels; 512 tmsize_t occ; 513 uint8* op; 514 uint32* tp; 515 516 assert(s == 0); 517 assert(sp != NULL); 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 /* write out encoded pixels */ 528 op = tif->tif_rawcp; 529 occ = tif->tif_rawdatasize - tif->tif_rawcc; 530 for (i = npixels; i--; ) { 531 if (occ < 3) { 532 tif->tif_rawcp = op; 533 tif->tif_rawcc = tif->tif_rawdatasize - occ; 534 if (!TIFFFlushData1(tif)) 535 return (-1); 536 op = tif->tif_rawcp; 537 occ = tif->tif_rawdatasize - tif->tif_rawcc; 538 } 539 *op++ = (uint8)(*tp >> 16); 540 *op++ = (uint8)(*tp >> 8 & 0xff); 541 *op++ = (uint8)(*tp++ & 0xff); 542 occ -= 3; 543 } 544 tif->tif_rawcp = op; 545 tif->tif_rawcc = tif->tif_rawdatasize - occ; 546 547 return (1); 548} 549 550/* 551 * Encode a row of 32-bit pixels. 552 */ 553static int 554LogLuvEncode32(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) 555{ 556 LogLuvState* sp = EncoderState(tif); 557 int shft; 558 tmsize_t i; 559 tmsize_t j; 560 tmsize_t npixels; 561 uint8* op; 562 uint32* tp; 563 uint32 b; 564 tmsize_t occ; 565 int rc=0, mask; 566 tmsize_t beg; 567 568 assert(s == 0); 569 assert(sp != NULL); 570 571 npixels = cc / sp->pixel_size; 572 573 if (sp->user_datafmt == SGILOGDATAFMT_RAW) 574 tp = (uint32*) bp; 575 else { 576 tp = (uint32*) sp->tbuf; 577 assert(sp->tbuflen >= npixels); 578 (*sp->tfunc)(sp, bp, npixels); 579 } 580 /* compress each byte string */ 581 op = tif->tif_rawcp; 582 occ = tif->tif_rawdatasize - tif->tif_rawcc; 583 for (shft = 4*8; (shft -= 8) >= 0; ) 584 for (i = 0; i < npixels; i += rc) { 585 if (occ < 4) { 586 tif->tif_rawcp = op; 587 tif->tif_rawcc = tif->tif_rawdatasize - occ; 588 if (!TIFFFlushData1(tif)) 589 return (-1); 590 op = tif->tif_rawcp; 591 occ = tif->tif_rawdatasize - tif->tif_rawcc; 592 } 593 mask = 0xff << shft; /* find next run */ 594 for (beg = i; beg < npixels; beg += rc) { 595 b = tp[beg] & mask; 596 rc = 1; 597 while (rc < 127+2 && beg+rc < npixels && 598 (tp[beg+rc] & mask) == b) 599 rc++; 600 if (rc >= MINRUN) 601 break; /* long enough */ 602 } 603 if (beg-i > 1 && beg-i < MINRUN) { 604 b = tp[i] & mask; /* check short run */ 605 j = i+1; 606 while ((tp[j++] & mask) == b) 607 if (j == beg) { 608 *op++ = (uint8)(128-2+j-i); 609 *op++ = (uint8)(b >> shft); 610 occ -= 2; 611 i = beg; 612 break; 613 } 614 } 615 while (i < beg) { /* write out non-run */ 616 if ((j = beg-i) > 127) j = 127; 617 if (occ < j+3) { 618 tif->tif_rawcp = op; 619 tif->tif_rawcc = tif->tif_rawdatasize - occ; 620 if (!TIFFFlushData1(tif)) 621 return (-1); 622 op = tif->tif_rawcp; 623 occ = tif->tif_rawdatasize - tif->tif_rawcc; 624 } 625 *op++ = (uint8) j; occ--; 626 while (j--) { 627 *op++ = (uint8)(tp[i++] >> shft & 0xff); 628 occ--; 629 } 630 } 631 if (rc >= MINRUN) { /* write out run */ 632 *op++ = (uint8) (128-2+rc); 633 *op++ = (uint8)(tp[beg] >> shft & 0xff); 634 occ -= 2; 635 } else 636 rc = 0; 637 } 638 tif->tif_rawcp = op; 639 tif->tif_rawcc = tif->tif_rawdatasize - occ; 640 641 return (1); 642} 643 644/* 645 * Encode a strip of pixels. We break it into rows to 646 * avoid encoding runs across row boundaries. 647 */ 648static int 649LogLuvEncodeStrip(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) 650{ 651 tmsize_t rowlen = TIFFScanlineSize(tif); 652 653 if (rowlen == 0) 654 return 0; 655 656 assert(cc%rowlen == 0); 657 while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 1) 658 bp += rowlen, cc -= rowlen; 659 return (cc == 0); 660} 661 662/* 663 * Encode a tile of pixels. We break it into rows to 664 * avoid encoding runs across row boundaries. 665 */ 666static int 667LogLuvEncodeTile(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) 668{ 669 tmsize_t rowlen = TIFFTileRowSize(tif); 670 671 if (rowlen == 0) 672 return 0; 673 674 assert(cc%rowlen == 0); 675 while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 1) 676 bp += rowlen, cc -= rowlen; 677 return (cc == 0); 678} 679 680/* 681 * Encode/Decode functions for converting to and from user formats. 682 */ 683 684#include "uvcode.h" 685 686#ifndef UVSCALE 687#define U_NEU 0.210526316 688#define V_NEU 0.473684211 689#define UVSCALE 410. 690#endif 691 692#ifndef M_LN2 693#define M_LN2 0.69314718055994530942 694#endif 695#ifndef M_PI 696#define M_PI 3.14159265358979323846 697#endif 698#undef log2 /* Conflict with C'99 function */ 699#define log2(x) ((1./M_LN2)*log(x)) 700#undef exp2 /* Conflict with C'99 function */ 701#define exp2(x) exp(M_LN2*(x)) 702 703#define itrunc(x,m) ((m)==SGILOGENCODE_NODITHER ? \ 704 (int)(x) : \ 705 (int)((x) + rand()*(1./RAND_MAX) - .5)) 706 707#if !LOGLUV_PUBLIC 708static 709#endif 710double 711LogL16toY(int p16) /* compute luminance from 16-bit LogL */ 712{ 713 int Le = p16 & 0x7fff; 714 double Y; 715 716 if (!Le) 717 return (0.); 718 Y = exp(M_LN2/256.*(Le+.5) - M_LN2*64.); 719 return (!(p16 & 0x8000) ? Y : -Y); 720} 721 722#if !LOGLUV_PUBLIC 723static 724#endif 725int 726LogL16fromY(double Y, int em) /* get 16-bit LogL from Y */ 727{ 728 if (Y >= 1.8371976e19) 729 return (0x7fff); 730 if (Y <= -1.8371976e19) 731 return (0xffff); 732 if (Y > 5.4136769e-20) 733 return itrunc(256.*(log2(Y) + 64.), em); 734 if (Y < -5.4136769e-20) 735 return (~0x7fff | itrunc(256.*(log2(-Y) + 64.), em)); 736 return (0); 737} 738 739static void 740L16toY(LogLuvState* sp, uint8* op, tmsize_t n) 741{ 742 int16* l16 = (int16*) sp->tbuf; 743 float* yp = (float*) op; 744 745 while (n-- > 0) 746 *yp++ = (float)LogL16toY(*l16++); 747} 748 749static void 750L16toGry(LogLuvState* sp, uint8* op, tmsize_t n) 751{ 752 int16* l16 = (int16*) sp->tbuf; 753 uint8* gp = (uint8*) op; 754 755 while (n-- > 0) { 756 double Y = LogL16toY(*l16++); 757 *gp++ = (uint8) ((Y <= 0.) ? 0 : (Y >= 1.) ? 255 : (int)(256.*sqrt(Y))); 758 } 759} 760 761static void 762L16fromY(LogLuvState* sp, uint8* op, tmsize_t n) 763{ 764 int16* l16 = (int16*) sp->tbuf; 765 float* yp = (float*) op; 766 767 while (n-- > 0) 768 *l16++ = (int16) (LogL16fromY(*yp++, sp->encode_meth)); 769} 770 771#if !LOGLUV_PUBLIC 772static 773#endif 774void 775XYZtoRGB24(float xyz[3], uint8 rgb[3]) 776{ 777 double r, g, b; 778 /* assume CCIR-709 primaries */ 779 r = 2.690*xyz[0] + -1.276*xyz[1] + -0.414*xyz[2]; 780 g = -1.022*xyz[0] + 1.978*xyz[1] + 0.044*xyz[2]; 781 b = 0.061*xyz[0] + -0.224*xyz[1] + 1.163*xyz[2]; 782 /* assume 2.0 gamma for speed */ 783 /* could use integer sqrt approx., but this is probably faster */ 784 rgb[0] = (uint8)((r<=0.) ? 0 : (r >= 1.) ? 255 : (int)(256.*sqrt(r))); 785 rgb[1] = (uint8)((g<=0.) ? 0 : (g >= 1.) ? 255 : (int)(256.*sqrt(g))); 786 rgb[2] = (uint8)((b<=0.) ? 0 : (b >= 1.) ? 255 : (int)(256.*sqrt(b))); 787} 788 789#if !LOGLUV_PUBLIC 790static 791#endif 792double 793LogL10toY(int p10) /* compute luminance from 10-bit LogL */ 794{ 795 if (p10 == 0) 796 return (0.); 797 return (exp(M_LN2/64.*(p10+.5) - M_LN2*12.)); 798} 799 800#if !LOGLUV_PUBLIC 801static 802#endif 803int 804LogL10fromY(double Y, int em) /* get 10-bit LogL from Y */ 805{ 806 if (Y >= 15.742) 807 return (0x3ff); 808 else if (Y <= .00024283) 809 return (0); 810 else 811 return itrunc(64.*(log2(Y) + 12.), em); 812} 813 814#define NANGLES 100 815#define uv2ang(u, v) ( (NANGLES*.499999999/M_PI) \ 816 * atan2((v)-V_NEU,(u)-U_NEU) + .5*NANGLES ) 817 818static int 819oog_encode(double u, double v) /* encode out-of-gamut chroma */ 820{ 821 static int oog_table[NANGLES]; 822 static int initialized = 0; 823 register int i; 824 825 if (!initialized) { /* set up perimeter table */ 826 double eps[NANGLES], ua, va, ang, epsa; 827 int ui, vi, ustep; 828 for (i = NANGLES; i--; ) 829 eps[i] = 2.; 830 for (vi = UV_NVS; vi--; ) { 831 va = UV_VSTART + (vi+.5)*UV_SQSIZ; 832 ustep = uv_row[vi].nus-1; 833 if (vi == UV_NVS-1 || vi == 0 || ustep <= 0) 834 ustep = 1; 835 for (ui = uv_row[vi].nus-1; ui >= 0; ui -= ustep) { 836 ua = uv_row[vi].ustart + (ui+.5)*UV_SQSIZ; 837 ang = uv2ang(ua, va); 838 i = (int) ang; 839 epsa = fabs(ang - (i+.5)); 840 if (epsa < eps[i]) { 841 oog_table[i] = uv_row[vi].ncum + ui; 842 eps[i] = epsa; 843 } 844 } 845 } 846 for (i = NANGLES; i--; ) /* fill any holes */ 847 if (eps[i] > 1.5) { 848 int i1, i2; 849 for (i1 = 1; i1 < NANGLES/2; i1++) 850 if (eps[(i+i1)%NANGLES] < 1.5) 851 break; 852 for (i2 = 1; i2 < NANGLES/2; i2++) 853 if (eps[(i+NANGLES-i2)%NANGLES] < 1.5) 854 break; 855 if (i1 < i2) 856 oog_table[i] = 857 oog_table[(i+i1)%NANGLES]; 858 else 859 oog_table[i] = 860 oog_table[(i+NANGLES-i2)%NANGLES]; 861 } 862 initialized = 1; 863 } 864 i = (int) uv2ang(u, v); /* look up hue angle */ 865 return (oog_table[i]); 866} 867 868#undef uv2ang 869#undef NANGLES 870 871#if !LOGLUV_PUBLIC 872static 873#endif 874int 875uv_encode(double u, double v, int em) /* encode (u',v') coordinates */ 876{ 877 register int vi, ui; 878 879 if (v < UV_VSTART) 880 return oog_encode(u, v); 881 vi = itrunc((v - UV_VSTART)*(1./UV_SQSIZ), em); 882 if (vi >= UV_NVS) 883 return oog_encode(u, v); 884 if (u < uv_row[vi].ustart) 885 return oog_encode(u, v); 886 ui = itrunc((u - uv_row[vi].ustart)*(1./UV_SQSIZ), em); 887 if (ui >= uv_row[vi].nus) 888 return oog_encode(u, v); 889 890 return (uv_row[vi].ncum + ui); 891} 892 893#if !LOGLUV_PUBLIC 894static 895#endif 896int 897uv_decode(double *up, double *vp, int c) /* decode (u',v') index */ 898{ 899 int upper, lower; 900 register int ui, vi; 901 902 if (c < 0 || c >= UV_NDIVS) 903 return (-1); 904 lower = 0; /* binary search */ 905 upper = UV_NVS; 906 while (upper - lower > 1) { 907 vi = (lower + upper) >> 1; 908 ui = c - uv_row[vi].ncum; 909 if (ui > 0) 910 lower = vi; 911 else if (ui < 0) 912 upper = vi; 913 else { 914 lower = vi; 915 break; 916 } 917 } 918 vi = lower; 919 ui = c - uv_row[vi].ncum; 920 *up = uv_row[vi].ustart + (ui+.5)*UV_SQSIZ; 921 *vp = UV_VSTART + (vi+.5)*UV_SQSIZ; 922 return (0); 923} 924 925#if !LOGLUV_PUBLIC 926static 927#endif 928void 929LogLuv24toXYZ(uint32 p, float XYZ[3]) 930{ 931 int Ce; 932 double L, u, v, s, x, y; 933 /* decode luminance */ 934 L = LogL10toY(p>>14 & 0x3ff); 935 if (L <= 0.) { 936 XYZ[0] = XYZ[1] = XYZ[2] = 0.; 937 return; 938 } 939 /* decode color */ 940 Ce = p & 0x3fff; 941 if (uv_decode(&u, &v, Ce) < 0) { 942 u = U_NEU; v = V_NEU; 943 } 944 s = 1./(6.*u - 16.*v + 12.); 945 x = 9.*u * s; 946 y = 4.*v * s; 947 /* convert to XYZ */ 948 XYZ[0] = (float)(x/y * L); 949 XYZ[1] = (float)L; 950 XYZ[2] = (float)((1.-x-y)/y * L); 951} 952 953#if !LOGLUV_PUBLIC 954static 955#endif 956uint32 957LogLuv24fromXYZ(float XYZ[3], int em) 958{ 959 int Le, Ce; 960 double u, v, s; 961 /* encode luminance */ 962 Le = LogL10fromY(XYZ[1], em); 963 /* encode color */ 964 s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2]; 965 if (!Le || s <= 0.) { 966 u = U_NEU; 967 v = V_NEU; 968 } else { 969 u = 4.*XYZ[0] / s; 970 v = 9.*XYZ[1] / s; 971 } 972 Ce = uv_encode(u, v, em); 973 if (Ce < 0) /* never happens */ 974 Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER); 975 /* combine encodings */ 976 return (Le << 14 | Ce); 977} 978 979static void 980Luv24toXYZ(LogLuvState* sp, uint8* op, tmsize_t n) 981{ 982 uint32* luv = (uint32*) sp->tbuf; 983 float* xyz = (float*) op; 984 985 while (n-- > 0) { 986 LogLuv24toXYZ(*luv, xyz); 987 xyz += 3; 988 luv++; 989 } 990} 991 992static void 993Luv24toLuv48(LogLuvState* sp, uint8* op, tmsize_t n) 994{ 995 uint32* luv = (uint32*) sp->tbuf; 996 int16* luv3 = (int16*) op; 997 998 while (n-- > 0) { 999 double u, v; 1000 1001 *luv3++ = (int16)((*luv >> 12 & 0xffd) + 13314); 1002 if (uv_decode(&u, &v, *luv&0x3fff) < 0) { 1003 u = U_NEU; 1004 v = V_NEU; 1005 } 1006 *luv3++ = (int16)(u * (1L<<15)); 1007 *luv3++ = (int16)(v * (1L<<15)); 1008 luv++; 1009 } 1010} 1011 1012static void 1013Luv24toRGB(LogLuvState* sp, uint8* op, tmsize_t n) 1014{ 1015 uint32* luv = (uint32*) sp->tbuf; 1016 uint8* rgb = (uint8*) op; 1017 1018 while (n-- > 0) { 1019 float xyz[3]; 1020 1021 LogLuv24toXYZ(*luv++, xyz); 1022 XYZtoRGB24(xyz, rgb); 1023 rgb += 3; 1024 } 1025} 1026 1027static void 1028Luv24fromXYZ(LogLuvState* sp, uint8* op, tmsize_t n) 1029{ 1030 uint32* luv = (uint32*) sp->tbuf; 1031 float* xyz = (float*) op; 1032 1033 while (n-- > 0) { 1034 *luv++ = LogLuv24fromXYZ(xyz, sp->encode_meth); 1035 xyz += 3; 1036 } 1037} 1038 1039static void 1040Luv24fromLuv48(LogLuvState* sp, uint8* op, tmsize_t n) 1041{ 1042 uint32* luv = (uint32*) sp->tbuf; 1043 int16* luv3 = (int16*) op; 1044 1045 while (n-- > 0) { 1046 int Le, Ce; 1047 1048 if (luv3[0] <= 0) 1049 Le = 0; 1050 else if (luv3[0] >= (1<<12)+3314) 1051 Le = (1<<10) - 1; 1052 else if (sp->encode_meth == SGILOGENCODE_NODITHER) 1053 Le = (luv3[0]-3314) >> 2; 1054 else 1055 Le = itrunc(.25*(luv3[0]-3314.), sp->encode_meth); 1056 1057 Ce = uv_encode((luv3[1]+.5)/(1<<15), (luv3[2]+.5)/(1<<15), 1058 sp->encode_meth); 1059 if (Ce < 0) /* never happens */ 1060 Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER); 1061 *luv++ = (uint32)Le << 14 | Ce; 1062 luv3 += 3; 1063 } 1064} 1065 1066#if !LOGLUV_PUBLIC 1067static 1068#endif 1069void 1070LogLuv32toXYZ(uint32 p, float XYZ[3]) 1071{ 1072 double L, u, v, s, x, y; 1073 /* decode luminance */ 1074 L = LogL16toY((int)p >> 16); 1075 if (L <= 0.) { 1076 XYZ[0] = XYZ[1] = XYZ[2] = 0.; 1077 return; 1078 } 1079 /* decode color */ 1080 u = 1./UVSCALE * ((p>>8 & 0xff) + .5); 1081 v = 1./UVSCALE * ((p & 0xff) + .5); 1082 s = 1./(6.*u - 16.*v + 12.); 1083 x = 9.*u * s; 1084 y = 4.*v * s; 1085 /* convert to XYZ */ 1086 XYZ[0] = (float)(x/y * L); 1087 XYZ[1] = (float)L; 1088 XYZ[2] = (float)((1.-x-y)/y * L); 1089} 1090 1091#if !LOGLUV_PUBLIC 1092static 1093#endif 1094uint32 1095LogLuv32fromXYZ(float XYZ[3], int em) 1096{ 1097 unsigned int Le, ue, ve; 1098 double u, v, s; 1099 /* encode luminance */ 1100 Le = (unsigned int)LogL16fromY(XYZ[1], em); 1101 /* encode color */ 1102 s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2]; 1103 if (!Le || s <= 0.) { 1104 u = U_NEU; 1105 v = V_NEU; 1106 } else { 1107 u = 4.*XYZ[0] / s; 1108 v = 9.*XYZ[1] / s; 1109 } 1110 if (u <= 0.) ue = 0; 1111 else ue = itrunc(UVSCALE*u, em); 1112 if (ue > 255) ue = 255; 1113 if (v <= 0.) ve = 0; 1114 else ve = itrunc(UVSCALE*v, em); 1115 if (ve > 255) ve = 255; 1116 /* combine encodings */ 1117 return (Le << 16 | ue << 8 | ve); 1118} 1119 1120static void 1121Luv32toXYZ(LogLuvState* sp, uint8* op, tmsize_t n) 1122{ 1123 uint32* luv = (uint32*) sp->tbuf; 1124 float* xyz = (float*) op; 1125 1126 while (n-- > 0) { 1127 LogLuv32toXYZ(*luv++, xyz); 1128 xyz += 3; 1129 } 1130} 1131 1132static void 1133Luv32toLuv48(LogLuvState* sp, uint8* op, tmsize_t n) 1134{ 1135 uint32* luv = (uint32*) sp->tbuf; 1136 int16* luv3 = (int16*) op; 1137 1138 while (n-- > 0) { 1139 double u, v; 1140 1141 *luv3++ = (int16)(*luv >> 16); 1142 u = 1./UVSCALE * ((*luv>>8 & 0xff) + .5); 1143 v = 1./UVSCALE * ((*luv & 0xff) + .5); 1144 *luv3++ = (int16)(u * (1L<<15)); 1145 *luv3++ = (int16)(v * (1L<<15)); 1146 luv++; 1147 } 1148} 1149 1150static void 1151Luv32toRGB(LogLuvState* sp, uint8* op, tmsize_t n) 1152{ 1153 uint32* luv = (uint32*) sp->tbuf; 1154 uint8* rgb = (uint8*) op; 1155 1156 while (n-- > 0) { 1157 float xyz[3]; 1158 1159 LogLuv32toXYZ(*luv++, xyz); 1160 XYZtoRGB24(xyz, rgb); 1161 rgb += 3; 1162 } 1163} 1164 1165static void 1166Luv32fromXYZ(LogLuvState* sp, uint8* op, tmsize_t n) 1167{ 1168 uint32* luv = (uint32*) sp->tbuf; 1169 float* xyz = (float*) op; 1170 1171 while (n-- > 0) { 1172 *luv++ = LogLuv32fromXYZ(xyz, sp->encode_meth); 1173 xyz += 3; 1174 } 1175} 1176 1177static void 1178Luv32fromLuv48(LogLuvState* sp, uint8* op, tmsize_t n) 1179{ 1180 uint32* luv = (uint32*) sp->tbuf; 1181 int16* luv3 = (int16*) op; 1182 1183 if (sp->encode_meth == SGILOGENCODE_NODITHER) { 1184 while (n-- > 0) { 1185 *luv++ = (uint32)luv3[0] << 16 | 1186 (luv3[1]*(uint32)(UVSCALE+.5) >> 7 & 0xff00) | 1187 (luv3[2]*(uint32)(UVSCALE+.5) >> 15 & 0xff); 1188 luv3 += 3; 1189 } 1190 return; 1191 } 1192 while (n-- > 0) { 1193 *luv++ = (uint32)luv3[0] << 16 | 1194 (itrunc(luv3[1]*(UVSCALE/(1<<15)), sp->encode_meth) << 8 & 0xff00) | 1195 (itrunc(luv3[2]*(UVSCALE/(1<<15)), sp->encode_meth) & 0xff); 1196 luv3 += 3; 1197 } 1198} 1199 1200static void 1201_logLuvNop(LogLuvState* sp, uint8* op, tmsize_t n) 1202{ 1203 (void) sp; (void) op; (void) n; 1204} 1205 1206static int 1207LogL16GuessDataFmt(TIFFDirectory *td) 1208{ 1209#define PACK(s,b,f) (((b)<<6)|((s)<<3)|(f)) 1210 switch (PACK(td->td_samplesperpixel, td->td_bitspersample, td->td_sampleformat)) { 1211 case PACK(1, 32, SAMPLEFORMAT_IEEEFP): 1212 return (SGILOGDATAFMT_FLOAT); 1213 case PACK(1, 16, SAMPLEFORMAT_VOID): 1214 case PACK(1, 16, SAMPLEFORMAT_INT): 1215 case PACK(1, 16, SAMPLEFORMAT_UINT): 1216 return (SGILOGDATAFMT_16BIT); 1217 case PACK(1, 8, SAMPLEFORMAT_VOID): 1218 case PACK(1, 8, SAMPLEFORMAT_UINT): 1219 return (SGILOGDATAFMT_8BIT); 1220 } 1221#undef PACK 1222 return (SGILOGDATAFMT_UNKNOWN); 1223} 1224 1225static tmsize_t 1226multiply_ms(tmsize_t m1, tmsize_t m2) 1227{ 1228 tmsize_t bytes = m1 * m2; 1229 1230 if (m1 && bytes / m1 != m2) 1231 bytes = 0; 1232 1233 return bytes; 1234} 1235 1236static int 1237LogL16InitState(TIFF* tif) 1238{ 1239 static const char module[] = "LogL16InitState"; 1240 TIFFDirectory *td = &tif->tif_dir; 1241 LogLuvState* sp = DecoderState(tif); 1242 1243 assert(sp != NULL); 1244 assert(td->td_photometric == PHOTOMETRIC_LOGL); 1245 1246 /* for some reason, we can't do this in TIFFInitLogL16 */ 1247 if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN) 1248 sp->user_datafmt = LogL16GuessDataFmt(td); 1249 switch (sp->user_datafmt) { 1250 case SGILOGDATAFMT_FLOAT: 1251 sp->pixel_size = sizeof (float); 1252 break; 1253 case SGILOGDATAFMT_16BIT: 1254 sp->pixel_size = sizeof (int16); 1255 break; 1256 case SGILOGDATAFMT_8BIT: 1257 sp->pixel_size = sizeof (uint8); 1258 break; 1259 default: 1260 TIFFErrorExt(tif->tif_clientdata, module, 1261 "No support for converting user data format to LogL"); 1262 return (0); 1263 } 1264 if( isTiled(tif) ) 1265 sp->tbuflen = multiply_ms(td->td_tilewidth, td->td_tilelength); 1266 else 1267 sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_rowsperstrip); 1268 if (multiply_ms(sp->tbuflen, sizeof (int16)) == 0 || 1269 (sp->tbuf = (uint8*) _TIFFmalloc(sp->tbuflen * sizeof (int16))) == NULL) { 1270 TIFFErrorExt(tif->tif_clientdata, module, "No space for SGILog translation buffer"); 1271 return (0); 1272 } 1273 return (1); 1274} 1275 1276static int 1277LogLuvGuessDataFmt(TIFFDirectory *td) 1278{ 1279 int guess; 1280 1281 /* 1282 * If the user didn't tell us their datafmt, 1283 * take our best guess from the bitspersample. 1284 */ 1285#define PACK(a,b) (((a)<<3)|(b)) 1286 switch (PACK(td->td_bitspersample, td->td_sampleformat)) { 1287 case PACK(32, SAMPLEFORMAT_IEEEFP): 1288 guess = SGILOGDATAFMT_FLOAT; 1289 break; 1290 case PACK(32, SAMPLEFORMAT_VOID): 1291 case PACK(32, SAMPLEFORMAT_UINT): 1292 case PACK(32, SAMPLEFORMAT_INT): 1293 guess = SGILOGDATAFMT_RAW; 1294 break; 1295 case PACK(16, SAMPLEFORMAT_VOID): 1296 case PACK(16, SAMPLEFORMAT_INT): 1297 case PACK(16, SAMPLEFORMAT_UINT): 1298 guess = SGILOGDATAFMT_16BIT; 1299 break; 1300 case PACK( 8, SAMPLEFORMAT_VOID): 1301 case PACK( 8, SAMPLEFORMAT_UINT): 1302 guess = SGILOGDATAFMT_8BIT; 1303 break; 1304 default: 1305 guess = SGILOGDATAFMT_UNKNOWN; 1306 break; 1307#undef PACK 1308 } 1309 /* 1310 * Double-check samples per pixel. 1311 */ 1312 switch (td->td_samplesperpixel) { 1313 case 1: 1314 if (guess != SGILOGDATAFMT_RAW) 1315 guess = SGILOGDATAFMT_UNKNOWN; 1316 break; 1317 case 3: 1318 if (guess == SGILOGDATAFMT_RAW) 1319 guess = SGILOGDATAFMT_UNKNOWN; 1320 break; 1321 default: 1322 guess = SGILOGDATAFMT_UNKNOWN; 1323 break; 1324 } 1325 return (guess); 1326} 1327 1328static int 1329LogLuvInitState(TIFF* tif) 1330{ 1331 static const char module[] = "LogLuvInitState"; 1332 TIFFDirectory* td = &tif->tif_dir; 1333 LogLuvState* sp = DecoderState(tif); 1334 1335 assert(sp != NULL); 1336 assert(td->td_photometric == PHOTOMETRIC_LOGLUV); 1337 1338 /* for some reason, we can't do this in TIFFInitLogLuv */ 1339 if (td->td_planarconfig != PLANARCONFIG_CONTIG) { 1340 TIFFErrorExt(tif->tif_clientdata, module, 1341 "SGILog compression cannot handle non-contiguous data"); 1342 return (0); 1343 } 1344 if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN) 1345 sp->user_datafmt = LogLuvGuessDataFmt(td); 1346 switch (sp->user_datafmt) { 1347 case SGILOGDATAFMT_FLOAT: 1348 sp->pixel_size = 3*sizeof (float); 1349 break; 1350 case SGILOGDATAFMT_16BIT: 1351 sp->pixel_size = 3*sizeof (int16); 1352 break; 1353 case SGILOGDATAFMT_RAW: 1354 sp->pixel_size = sizeof (uint32); 1355 break; 1356 case SGILOGDATAFMT_8BIT: 1357 sp->pixel_size = 3*sizeof (uint8); 1358 break; 1359 default: 1360 TIFFErrorExt(tif->tif_clientdata, module, 1361 "No support for converting user data format to LogLuv"); 1362 return (0); 1363 } 1364 if( isTiled(tif) ) 1365 sp->tbuflen = multiply_ms(td->td_tilewidth, td->td_tilelength); 1366 else 1367 sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_rowsperstrip); 1368 if (multiply_ms(sp->tbuflen, sizeof (uint32)) == 0 || 1369 (sp->tbuf = (uint8*) _TIFFmalloc(sp->tbuflen * sizeof (uint32))) == NULL) { 1370 TIFFErrorExt(tif->tif_clientdata, module, "No space for SGILog translation buffer"); 1371 return (0); 1372 } 1373 return (1); 1374} 1375 1376static int 1377LogLuvFixupTags(TIFF* tif) 1378{ 1379 (void) tif; 1380 return (1); 1381} 1382 1383static int 1384LogLuvSetupDecode(TIFF* tif) 1385{ 1386 static const char module[] = "LogLuvSetupDecode"; 1387 LogLuvState* sp = DecoderState(tif); 1388 TIFFDirectory* td = &tif->tif_dir; 1389 1390 tif->tif_postdecode = _TIFFNoPostDecode; 1391 switch (td->td_photometric) { 1392 case PHOTOMETRIC_LOGLUV: 1393 if (!LogLuvInitState(tif)) 1394 break; 1395 if (td->td_compression == COMPRESSION_SGILOG24) { 1396 tif->tif_decoderow = LogLuvDecode24; 1397 switch (sp->user_datafmt) { 1398 case SGILOGDATAFMT_FLOAT: 1399 sp->tfunc = Luv24toXYZ; 1400 break; 1401 case SGILOGDATAFMT_16BIT: 1402 sp->tfunc = Luv24toLuv48; 1403 break; 1404 case SGILOGDATAFMT_8BIT: 1405 sp->tfunc = Luv24toRGB; 1406 break; 1407 } 1408 } else { 1409 tif->tif_decoderow = LogLuvDecode32; 1410 switch (sp->user_datafmt) { 1411 case SGILOGDATAFMT_FLOAT: 1412 sp->tfunc = Luv32toXYZ; 1413 break; 1414 case SGILOGDATAFMT_16BIT: 1415 sp->tfunc = Luv32toLuv48; 1416 break; 1417 case SGILOGDATAFMT_8BIT: 1418 sp->tfunc = Luv32toRGB; 1419 break; 1420 } 1421 } 1422 return (1); 1423 case PHOTOMETRIC_LOGL: 1424 if (!LogL16InitState(tif)) 1425 break; 1426 tif->tif_decoderow = LogL16Decode; 1427 switch (sp->user_datafmt) { 1428 case SGILOGDATAFMT_FLOAT: 1429 sp->tfunc = L16toY; 1430 break; 1431 case SGILOGDATAFMT_8BIT: 1432 sp->tfunc = L16toGry; 1433 break; 1434 } 1435 return (1); 1436 default: 1437 TIFFErrorExt(tif->tif_clientdata, module, 1438 "Inappropriate photometric interpretation %d for SGILog compression; %s", 1439 td->td_photometric, "must be either LogLUV or LogL"); 1440 break; 1441 } 1442 return (0); 1443} 1444 1445static int 1446LogLuvSetupEncode(TIFF* tif) 1447{ 1448 static const char module[] = "LogLuvSetupEncode"; 1449 LogLuvState* sp = EncoderState(tif); 1450 TIFFDirectory* td = &tif->tif_dir; 1451 1452 switch (td->td_photometric) { 1453 case PHOTOMETRIC_LOGLUV: 1454 if (!LogLuvInitState(tif)) 1455 break; 1456 if (td->td_compression == COMPRESSION_SGILOG24) { 1457 tif->tif_encoderow = LogLuvEncode24; 1458 switch (sp->user_datafmt) { 1459 case SGILOGDATAFMT_FLOAT: 1460 sp->tfunc = Luv24fromXYZ; 1461 break; 1462 case SGILOGDATAFMT_16BIT: 1463 sp->tfunc = Luv24fromLuv48; 1464 break; 1465 case SGILOGDATAFMT_RAW: 1466 break; 1467 default: 1468 goto notsupported; 1469 } 1470 } else { 1471 tif->tif_encoderow = LogLuvEncode32; 1472 switch (sp->user_datafmt) { 1473 case SGILOGDATAFMT_FLOAT: 1474 sp->tfunc = Luv32fromXYZ; 1475 break; 1476 case SGILOGDATAFMT_16BIT: 1477 sp->tfunc = Luv32fromLuv48; 1478 break; 1479 case SGILOGDATAFMT_RAW: 1480 break; 1481 default: 1482 goto notsupported; 1483 } 1484 } 1485 break; 1486 case PHOTOMETRIC_LOGL: 1487 if (!LogL16InitState(tif)) 1488 break; 1489 tif->tif_encoderow = LogL16Encode; 1490 switch (sp->user_datafmt) { 1491 case SGILOGDATAFMT_FLOAT: 1492 sp->tfunc = L16fromY; 1493 break; 1494 case SGILOGDATAFMT_16BIT: 1495 break; 1496 default: 1497 goto notsupported; 1498 } 1499 break; 1500 default: 1501 TIFFErrorExt(tif->tif_clientdata, module, 1502 "Inappropriate photometric interpretation %d for SGILog compression; %s", 1503 td->td_photometric, "must be either LogLUV or LogL"); 1504 break; 1505 } 1506 return (1); 1507notsupported: 1508 TIFFErrorExt(tif->tif_clientdata, module, 1509 "SGILog compression supported only for %s, or raw data", 1510 td->td_photometric == PHOTOMETRIC_LOGL ? "Y, L" : "XYZ, Luv"); 1511 return (0); 1512} 1513 1514static void 1515LogLuvClose(TIFF* tif) 1516{ 1517 TIFFDirectory *td = &tif->tif_dir; 1518 1519 /* 1520 * For consistency, we always want to write out the same 1521 * bitspersample and sampleformat for our TIFF file, 1522 * regardless of the data format being used by the application. 1523 * Since this routine is called after tags have been set but 1524 * before they have been recorded in the file, we reset them here. 1525 */ 1526 td->td_samplesperpixel = 1527 (td->td_photometric == PHOTOMETRIC_LOGL) ? 1 : 3; 1528 td->td_bitspersample = 16; 1529 td->td_sampleformat = SAMPLEFORMAT_INT; 1530} 1531 1532static void 1533LogLuvCleanup(TIFF* tif) 1534{ 1535 LogLuvState* sp = (LogLuvState *)tif->tif_data; 1536 1537 assert(sp != 0); 1538 1539 tif->tif_tagmethods.vgetfield = sp->vgetparent; 1540 tif->tif_tagmethods.vsetfield = sp->vsetparent; 1541 1542 if (sp->tbuf) 1543 _TIFFfree(sp->tbuf); 1544 _TIFFfree(sp); 1545 tif->tif_data = NULL; 1546 1547 _TIFFSetDefaultCompressionState(tif); 1548} 1549 1550static int 1551LogLuvVSetField(TIFF* tif, uint32 tag, va_list ap) 1552{ 1553 static const char module[] = "LogLuvVSetField"; 1554 LogLuvState* sp = DecoderState(tif); 1555 int bps, fmt; 1556 1557 switch (tag) { 1558 case TIFFTAG_SGILOGDATAFMT: 1559 sp->user_datafmt = (int) va_arg(ap, int); 1560 /* 1561 * Tweak the TIFF header so that the rest of libtiff knows what 1562 * size of data will be passed between app and library, and 1563 * assume that the app knows what it is doing and is not 1564 * confused by these header manipulations... 1565 */ 1566 switch (sp->user_datafmt) { 1567 case SGILOGDATAFMT_FLOAT: 1568 bps = 32, fmt = SAMPLEFORMAT_IEEEFP; 1569 break; 1570 case SGILOGDATAFMT_16BIT: 1571 bps = 16, fmt = SAMPLEFORMAT_INT; 1572 break; 1573 case SGILOGDATAFMT_RAW: 1574 bps = 32, fmt = SAMPLEFORMAT_UINT; 1575 TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, 1); 1576 break; 1577 case SGILOGDATAFMT_8BIT: 1578 bps = 8, fmt = SAMPLEFORMAT_UINT; 1579 break; 1580 default: 1581 TIFFErrorExt(tif->tif_clientdata, tif->tif_name, 1582 "Unknown data format %d for LogLuv compression", 1583 sp->user_datafmt); 1584 return (0); 1585 } 1586 TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, bps); 1587 TIFFSetField(tif, TIFFTAG_SAMPLEFORMAT, fmt); 1588 /* 1589 * Must recalculate sizes should bits/sample change. 1590 */ 1591 tif->tif_tilesize = isTiled(tif) ? TIFFTileSize(tif) : (tmsize_t) -1; 1592 tif->tif_scanlinesize = TIFFScanlineSize(tif); 1593 return (1); 1594 case TIFFTAG_SGILOGENCODE: 1595 sp->encode_meth = (int) va_arg(ap, int); 1596 if (sp->encode_meth != SGILOGENCODE_NODITHER && 1597 sp->encode_meth != SGILOGENCODE_RANDITHER) { 1598 TIFFErrorExt(tif->tif_clientdata, module, 1599 "Unknown encoding %d for LogLuv compression", 1600 sp->encode_meth); 1601 return (0); 1602 } 1603 return (1); 1604 default: 1605 return (*sp->vsetparent)(tif, tag, ap); 1606 } 1607} 1608 1609static int 1610LogLuvVGetField(TIFF* tif, uint32 tag, va_list ap) 1611{ 1612 LogLuvState *sp = (LogLuvState *)tif->tif_data; 1613 1614 switch (tag) { 1615 case TIFFTAG_SGILOGDATAFMT: 1616 *va_arg(ap, int*) = sp->user_datafmt; 1617 return (1); 1618 default: 1619 return (*sp->vgetparent)(tif, tag, ap); 1620 } 1621} 1622 1623static const TIFFField LogLuvFields[] = { 1624 { TIFFTAG_SGILOGDATAFMT, 0, 0, TIFF_SHORT, 0, TIFF_SETGET_INT, TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, TRUE, FALSE, "SGILogDataFmt", NULL}, 1625 { TIFFTAG_SGILOGENCODE, 0, 0, TIFF_SHORT, 0, TIFF_SETGET_INT, TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, TRUE, FALSE, "SGILogEncode", NULL} 1626}; 1627 1628int 1629TIFFInitSGILog(TIFF* tif, int scheme) 1630{ 1631 static const char module[] = "TIFFInitSGILog"; 1632 LogLuvState* sp; 1633 1634 assert(scheme == COMPRESSION_SGILOG24 || scheme == COMPRESSION_SGILOG); 1635 1636 /* 1637 * Merge codec-specific tag information. 1638 */ 1639 if (!_TIFFMergeFields(tif, LogLuvFields, 1640 TIFFArrayCount(LogLuvFields))) { 1641 TIFFErrorExt(tif->tif_clientdata, module, 1642 "Merging SGILog codec-specific tags failed"); 1643 return 0; 1644 } 1645 1646 /* 1647 * Allocate state block so tag methods have storage to record values. 1648 */ 1649 tif->tif_data = (uint8*) _TIFFmalloc(sizeof (LogLuvState)); 1650 if (tif->tif_data == NULL) 1651 goto bad; 1652 sp = (LogLuvState*) tif->tif_data; 1653 _TIFFmemset((void*)sp, 0, sizeof (*sp)); 1654 sp->user_datafmt = SGILOGDATAFMT_UNKNOWN; 1655 sp->encode_meth = (scheme == COMPRESSION_SGILOG24) ? 1656 SGILOGENCODE_RANDITHER : SGILOGENCODE_NODITHER; 1657 sp->tfunc = _logLuvNop; 1658 1659 /* 1660 * Install codec methods. 1661 * NB: tif_decoderow & tif_encoderow are filled 1662 * in at setup time. 1663 */ 1664 tif->tif_fixuptags = LogLuvFixupTags; 1665 tif->tif_setupdecode = LogLuvSetupDecode; 1666 tif->tif_decodestrip = LogLuvDecodeStrip; 1667 tif->tif_decodetile = LogLuvDecodeTile; 1668 tif->tif_setupencode = LogLuvSetupEncode; 1669 tif->tif_encodestrip = LogLuvEncodeStrip; 1670 tif->tif_encodetile = LogLuvEncodeTile; 1671 tif->tif_close = LogLuvClose; 1672 tif->tif_cleanup = LogLuvCleanup; 1673 1674 /* 1675 * Override parent get/set field methods. 1676 */ 1677 sp->vgetparent = tif->tif_tagmethods.vgetfield; 1678 tif->tif_tagmethods.vgetfield = LogLuvVGetField; /* hook for codec tags */ 1679 sp->vsetparent = tif->tif_tagmethods.vsetfield; 1680 tif->tif_tagmethods.vsetfield = LogLuvVSetField; /* hook for codec tags */ 1681 1682 return (1); 1683bad: 1684 TIFFErrorExt(tif->tif_clientdata, module, 1685 "%s: No space for LogLuv state block", tif->tif_name); 1686 return (0); 1687} 1688#endif /* LOGLUV_SUPPORT */ 1689 1690/* vim: set ts=8 sts=8 sw=8 noet: */ 1691/* 1692 * Local Variables: 1693 * mode: c 1694 * c-basic-offset: 8 1695 * fill-column: 78 1696 * End: 1697 */ 1698