workbench/libs/lcms2/src/cmsio1.c

   1 //---------------------------------------------------------------------------------
   2 //
   3 //  Little Color Management System
   4 //  Copyright (c) 1998-2012 Marti Maria Saguer
   5 //
   6 // Permission is hereby granted, free of charge, to any person obtaining
   7 // a copy of this software and associated documentation files (the "Software"),
   8 // to deal in the Software without restriction, including without limitation
   9 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10 // and/or sell copies of the Software, and to permit persons to whom the Software
  11 // is furnished to do so, subject to the following conditions:
  12 //
  13 // The above copyright notice and this permission notice shall be included in
  14 // all copies or substantial portions of the Software.
  15 //
  16 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  17 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
  18 // THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  19 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  20 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  21 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  22 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23 //
  24 //---------------------------------------------------------------------------------
  25 //
  26
  27 #include "lcms2_internal.h"
  28
  29 // Read tags using low-level functions, provides necessary glue code to adapt versions, etc.
  30
  31 // LUT tags
  32 static const cmsTagSignature Device2PCS16[]   =  {cmsSigAToB0Tag,     // Perceptual
  33                                                   cmsSigAToB1Tag,     // Relative colorimetric
  34                                                   cmsSigAToB2Tag,     // Saturation
  35                                                   cmsSigAToB1Tag };   // Absolute colorimetric
  36
  37 static const cmsTagSignature Device2PCSFloat[] = {cmsSigDToB0Tag,     // Perceptual
  38                                                   cmsSigDToB1Tag,     // Relative colorimetric
  39                                                   cmsSigDToB2Tag,     // Saturation
  40                                                   cmsSigDToB3Tag };   // Absolute colorimetric
  41
  42 static const cmsTagSignature PCS2Device16[]    = {cmsSigBToA0Tag,     // Perceptual
  43                                                   cmsSigBToA1Tag,     // Relative colorimetric
  44                                                   cmsSigBToA2Tag,     // Saturation
  45                                                   cmsSigBToA1Tag };   // Absolute colorimetric
  46
  47 static const cmsTagSignature PCS2DeviceFloat[] = {cmsSigBToD0Tag,     // Perceptual
  48                                                   cmsSigBToD1Tag,     // Relative colorimetric
  49                                                   cmsSigBToD2Tag,     // Saturation
  50                                                   cmsSigBToD3Tag };   // Absolute colorimetric
  51
  52
  53 // Factors to convert from 1.15 fixed point to 0..1.0 range and vice-versa
  54 #define InpAdj   (1.0/MAX_ENCODEABLE_XYZ)     // (65536.0/(65535.0*2.0))
  55 #define OutpAdj  (MAX_ENCODEABLE_XYZ)         // ((2.0*65535.0)/65536.0)
  56
  57 // Several resources for gray conversions.
  58 static const cmsFloat64Number GrayInputMatrix[] = { (InpAdj*cmsD50X),  (InpAdj*cmsD50Y),  (InpAdj*cmsD50Z) };
  59 static const cmsFloat64Number OneToThreeInputMatrix[] = { 1, 1, 1 };
  60 static const cmsFloat64Number PickYMatrix[] = { 0, (OutpAdj*cmsD50Y), 0 };
  61 static const cmsFloat64Number PickLstarMatrix[] = { 1, 0, 0 };
  62
  63 // Get a media white point fixing some issues found in certain old profiles
  64 cmsBool  _cmsReadMediaWhitePoint(cmsCIEXYZ* Dest, cmsHPROFILE hProfile)
  65 {
  66     cmsCIEXYZ* Tag;
  67
  68     _cmsAssert(Dest != NULL);
  69
  70     Tag = (cmsCIEXYZ*) cmsReadTag(hProfile, cmsSigMediaWhitePointTag);
  71
  72     // If no wp, take D50
  73     if (Tag == NULL) {
  74         *Dest = *cmsD50_XYZ();
  75         return TRUE;
  76     }
  77
  78     // V2 display profiles should give D50
  79     if (cmsGetEncodedICCversion(hProfile) < 0x4000000) {
  80
  81         if (cmsGetDeviceClass(hProfile) == cmsSigDisplayClass) {
  82             *Dest = *cmsD50_XYZ();
  83             return TRUE;
  84         }
  85     }
  86
  87     // All seems ok
  88     *Dest = *Tag;
  89     return TRUE;
  90 }
  91
  92
  93 // Chromatic adaptation matrix. Fix some issues as well
  94 cmsBool  _cmsReadCHAD(cmsMAT3* Dest, cmsHPROFILE hProfile)
  95 {
  96     cmsMAT3* Tag;
  97
  98     _cmsAssert(Dest != NULL);
  99
 100     Tag = (cmsMAT3*) cmsReadTag(hProfile, cmsSigChromaticAdaptationTag);
 101
 102     if (Tag != NULL) {
 103         *Dest = *Tag;
 104         return TRUE;
 105     }
 106
 107     // No CHAD available, default it to identity
 108     _cmsMAT3identity(Dest);
 109
 110     // V2 display profiles should give D50
 111     if (cmsGetEncodedICCversion(hProfile) < 0x4000000) {
 112
 113         if (cmsGetDeviceClass(hProfile) == cmsSigDisplayClass) {
 114
 115             cmsCIEXYZ* White = (cmsCIEXYZ*) cmsReadTag(hProfile, cmsSigMediaWhitePointTag);
 116
 117             if (White == NULL) {
 118
 119                 _cmsMAT3identity(Dest);
 120                 return TRUE;
 121             }
 122
 123             return _cmsAdaptationMatrix(Dest, NULL, White, cmsD50_XYZ());
 124         }
 125     }
 126
 127     return TRUE;
 128 }
 129
 130
 131 // Auxiliar, read colorants as a MAT3 structure. Used by any function that needs a matrix-shaper
 132 static
 133 cmsBool ReadICCMatrixRGB2XYZ(cmsMAT3* r, cmsHPROFILE hProfile)
 134 {
 135     cmsCIEXYZ *PtrRed, *PtrGreen, *PtrBlue;
 136
 137     _cmsAssert(r != NULL);
 138
 139     PtrRed   = (cmsCIEXYZ *) cmsReadTag(hProfile, cmsSigRedColorantTag);
 140     PtrGreen = (cmsCIEXYZ *) cmsReadTag(hProfile, cmsSigGreenColorantTag);
 141     PtrBlue  = (cmsCIEXYZ *) cmsReadTag(hProfile, cmsSigBlueColorantTag);
 142
 143     if (PtrRed == NULL || PtrGreen == NULL || PtrBlue == NULL)
 144         return FALSE;
 145
 146     _cmsVEC3init(&r -> v[0], PtrRed -> X, PtrGreen -> X,  PtrBlue -> X);
 147     _cmsVEC3init(&r -> v[1], PtrRed -> Y, PtrGreen -> Y,  PtrBlue -> Y);
 148     _cmsVEC3init(&r -> v[2], PtrRed -> Z, PtrGreen -> Z,  PtrBlue -> Z);
 149
 150     return TRUE;
 151 }
 152
 153
 154 // Gray input pipeline
 155 static
 156 cmsPipeline* BuildGrayInputMatrixPipeline(cmsHPROFILE hProfile)
 157 {
 158     cmsToneCurve *GrayTRC;
 159     cmsPipeline* Lut;
 160     cmsContext ContextID = cmsGetProfileContextID(hProfile);
 161
 162     GrayTRC = (cmsToneCurve *) cmsReadTag(hProfile, cmsSigGrayTRCTag);
 163     if (GrayTRC == NULL) return NULL;
 164
 165     Lut = cmsPipelineAlloc(ContextID, 1, 3);
 166     if (Lut == NULL)
 167         goto Error;
 168
 169     if (cmsGetPCS(hProfile) == cmsSigLabData) {
 170
 171         // In this case we implement the profile as an  identity matrix plus 3 tone curves
 172         cmsUInt16Number Zero[2] = { 0x8080, 0x8080 };
 173         cmsToneCurve* EmptyTab;
 174         cmsToneCurve* LabCurves[3];
 175
 176         EmptyTab = cmsBuildTabulatedToneCurve16(ContextID, 2, Zero);
 177
 178         if (EmptyTab == NULL)
 179             goto Error;
 180
 181         LabCurves[0] = GrayTRC;
 182         LabCurves[1] = EmptyTab;
 183         LabCurves[2] = EmptyTab;
 184
 185         if (!cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocMatrix(ContextID, 3,  1, OneToThreeInputMatrix, NULL)) ||
 186             !cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocToneCurves(ContextID, 3, LabCurves))) {
 187                 cmsFreeToneCurve(EmptyTab);
 188                 goto Error;
 189         }
 190
 191         cmsFreeToneCurve(EmptyTab);
 192
 193     }
 194     else  {
 195
 196         if (!cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocToneCurves(ContextID, 1, &GrayTRC)) ||
 197             !cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocMatrix(ContextID, 3,  1, GrayInputMatrix, NULL)))
 198             goto Error;
 199     }
 200
 201     return Lut;
 202
 203 Error:
 204     cmsFreeToneCurve(GrayTRC);
 205     cmsPipelineFree(Lut);
 206     return NULL;
 207 }
 208
 209 // RGB Matrix shaper
 210 static
 211 cmsPipeline* BuildRGBInputMatrixShaper(cmsHPROFILE hProfile)
 212 {
 213     cmsPipeline* Lut;
 214     cmsMAT3 Mat;
 215     cmsToneCurve *Shapes[3];
 216     cmsContext ContextID = cmsGetProfileContextID(hProfile);
 217     int i, j;
 218
 219     if (!ReadICCMatrixRGB2XYZ(&Mat, hProfile)) return NULL;
 220
 221     // XYZ PCS in encoded in 1.15 format, and the matrix output comes in 0..0xffff range, so
 222     // we need to adjust the output by a factor of (0x10000/0xffff) to put data in
 223     // a 1.16 range, and then a >> 1 to obtain 1.15. The total factor is (65536.0)/(65535.0*2)
 224
 225     for (i=0; i < 3; i++)
 226         for (j=0; j < 3; j++)
 227             Mat.v[i].n[j] *= InpAdj;
 228
 229
 230     Shapes[0] = (cmsToneCurve *) cmsReadTag(hProfile, cmsSigRedTRCTag);
 231     Shapes[1] = (cmsToneCurve *) cmsReadTag(hProfile, cmsSigGreenTRCTag);
 232     Shapes[2] = (cmsToneCurve *) cmsReadTag(hProfile, cmsSigBlueTRCTag);
 233
 234     if (!Shapes[0] || !Shapes[1] || !Shapes[2])
 235         return NULL;
 236
 237     Lut = cmsPipelineAlloc(ContextID, 3, 3);
 238     if (Lut != NULL) {
 239
 240         if (!cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocToneCurves(ContextID, 3, Shapes)) ||
 241             !cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocMatrix(ContextID, 3, 3, (cmsFloat64Number*) &Mat, NULL)))
 242             goto Error;
 243
 244         // Note that it is certainly possible a single profile would have a LUT based
 245         // tag for output working in lab and a matrix-shaper for the fallback cases.
 246         // This is not allowed by the spec, but this code is tolerant to those cases
 247         if (cmsGetPCS(hProfile) == cmsSigLabData) {
 248
 249             if (!cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageAllocXYZ2Lab(ContextID)))
 250                 goto Error;
 251         }
 252
 253     }
 254
 255     return Lut;
 256
 257 Error:
 258     cmsPipelineFree(Lut);
 259     return NULL;
 260 }
 261
 262
 263
 264 // Read the DToAX tag, adjusting the encoding of Lab or XYZ if neded
 265 static
 266 cmsPipeline* _cmsReadFloatInputTag(cmsHPROFILE hProfile, cmsTagSignature tagFloat)
 267 {
 268     cmsContext ContextID       = cmsGetProfileContextID(hProfile);
 269     cmsPipeline* Lut           = cmsPipelineDup((cmsPipeline*) cmsReadTag(hProfile, tagFloat));
 270     cmsColorSpaceSignature spc = cmsGetColorSpace(hProfile);
 271     cmsColorSpaceSignature PCS = cmsGetPCS(hProfile);
 272
 273     if (Lut == NULL) return NULL;
 274
 275     // input and output of transform are in lcms 0..1 encoding.  If XYZ or Lab spaces are used,
 276     //  these need to be normalized into the appropriate ranges (Lab = 100,0,0, XYZ=1.0,1.0,1.0)
 277     if ( spc == cmsSigLabData)
 278     {
 279         if (!cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageNormalizeToLabFloat(ContextID)))
 280             goto Error;
 281     }
 282     else if (spc == cmsSigXYZData)
 283     {
 284         if (!cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageNormalizeToXyzFloat(ContextID)))
 285             goto Error;
 286     }
 287
 288     if ( PCS == cmsSigLabData)
 289     {
 290         if (!cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageNormalizeFromLabFloat(ContextID)))
 291             goto Error;
 292     }
 293     else if( PCS == cmsSigXYZData)
 294     {
 295         if (!cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageNormalizeFromXyzFloat(ContextID)))
 296             goto Error;
 297     }
 298
 299     return Lut;
 300
 301 Error:
 302     cmsPipelineFree(Lut);
 303     return NULL;
 304 }
 305
 306
 307 // Read and create a BRAND NEW MPE LUT from a given profile. All stuff dependent of version, etc
 308 // is adjusted here in order to create a LUT that takes care of all those details
 309 cmsPipeline* _cmsReadInputLUT(cmsHPROFILE hProfile, int Intent)
 310 {
 311     cmsTagTypeSignature OriginalType;
 312     cmsTagSignature tag16    = Device2PCS16[Intent];
 313     cmsTagSignature tagFloat = Device2PCSFloat[Intent];
 314     cmsContext ContextID = cmsGetProfileContextID(hProfile);
 315
 316     // On named color, take the appropiate tag
 317     if (cmsGetDeviceClass(hProfile) == cmsSigNamedColorClass) {
 318
 319         cmsPipeline* Lut;
 320         cmsNAMEDCOLORLIST* nc = (cmsNAMEDCOLORLIST*) cmsReadTag(hProfile, cmsSigNamedColor2Tag);
 321
 322         if (nc == NULL) return NULL;
 323
 324         Lut = cmsPipelineAlloc(ContextID, 0, 0);
 325         if (Lut == NULL) {
 326             cmsFreeNamedColorList(nc);
 327             return NULL;
 328         }
 329
 330         if (!cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageAllocNamedColor(nc, TRUE)) ||
 331             !cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageAllocLabV2ToV4(ContextID))) {
 332             cmsPipelineFree(Lut);
 333             return NULL;
 334         }
 335         return Lut;
 336     }
 337
 338     if (cmsIsTag(hProfile, tagFloat)) {  // Float tag takes precedence
 339
 340         // Floating point LUT are always V4, but the encoding range is no
 341         // longer 0..1.0, so we need to add an stage depending on the color space
 342          return _cmsReadFloatInputTag(hProfile, tagFloat);
 343     }
 344
 345     // Revert to perceptual if no tag is found
 346     if (!cmsIsTag(hProfile, tag16)) {
 347         tag16 = Device2PCS16[0];
 348     }
 349
 350     if (cmsIsTag(hProfile, tag16)) { // Is there any LUT-Based table?
 351
 352         // Check profile version and LUT type. Do the necessary adjustments if needed
 353
 354         // First read the tag
 355         cmsPipeline* Lut = (cmsPipeline*) cmsReadTag(hProfile, tag16);
 356         if (Lut == NULL) return NULL;
 357
 358         // After reading it, we have now info about the original type
 359         OriginalType =  _cmsGetTagTrueType(hProfile, tag16);
 360
 361         // The profile owns the Lut, so we need to copy it
 362         Lut = cmsPipelineDup(Lut);
 363
 364         // We need to adjust data only for Lab16 on output
 365         if (OriginalType != cmsSigLut16Type || cmsGetPCS(hProfile) != cmsSigLabData)
 366             return Lut;
 367
 368         // If the input is Lab, add also a conversion at the begin
 369         if (cmsGetColorSpace(hProfile) == cmsSigLabData &&
 370             !cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageAllocLabV4ToV2(ContextID)))
 371             goto Error;
 372
 373         // Add a matrix for conversion V2 to V4 Lab PCS
 374         if (!cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageAllocLabV2ToV4(ContextID)))
 375             goto Error;
 376
 377         return Lut;
 378 Error:
 379         cmsPipelineFree(Lut);
 380         return NULL;
 381     }
 382
 383     // Lut was not found, try to create a matrix-shaper
 384
 385     // Check if this is a grayscale profile.
 386     if (cmsGetColorSpace(hProfile) == cmsSigGrayData) {
 387
 388         // if so, build appropiate conversion tables.
 389         // The tables are the PCS iluminant, scaled across GrayTRC
 390         return BuildGrayInputMatrixPipeline(hProfile);
 391     }
 392
 393     // Not gray, create a normal matrix-shaper
 394     return BuildRGBInputMatrixShaper(hProfile);
 395 }
 396
 397 // ---------------------------------------------------------------------------------------------------------------
 398
 399 // Gray output pipeline.
 400 // XYZ -> Gray or Lab -> Gray. Since we only know the GrayTRC, we need to do some assumptions. Gray component will be
 401 // given by Y on XYZ PCS and by L* on Lab PCS, Both across inverse TRC curve.
 402 // The complete pipeline on XYZ is Matrix[3:1] -> Tone curve and in Lab Matrix[3:1] -> Tone Curve as well.
 403
 404 static
 405 cmsPipeline* BuildGrayOutputPipeline(cmsHPROFILE hProfile)
 406 {
 407     cmsToneCurve *GrayTRC, *RevGrayTRC;
 408     cmsPipeline* Lut;
 409     cmsContext ContextID = cmsGetProfileContextID(hProfile);
 410
 411     GrayTRC = (cmsToneCurve *) cmsReadTag(hProfile, cmsSigGrayTRCTag);
 412     if (GrayTRC == NULL) return NULL;
 413
 414     RevGrayTRC = cmsReverseToneCurve(GrayTRC);
 415     if (RevGrayTRC == NULL) return NULL;
 416
 417     Lut = cmsPipelineAlloc(ContextID, 3, 1);
 418     if (Lut == NULL) {
 419         cmsFreeToneCurve(RevGrayTRC);
 420         return NULL;
 421     }
 422
 423     if (cmsGetPCS(hProfile) == cmsSigLabData) {
 424
 425         if (!cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocMatrix(ContextID, 1,  3, PickLstarMatrix, NULL)))
 426             goto Error;
 427     }
 428     else  {
 429         if (!cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocMatrix(ContextID, 1,  3, PickYMatrix, NULL)))
 430             goto Error;
 431     }
 432
 433     if (!cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocToneCurves(ContextID, 1, &RevGrayTRC)))
 434         goto Error;
 435
 436     cmsFreeToneCurve(RevGrayTRC);
 437     return Lut;
 438
 439 Error:
 440     cmsFreeToneCurve(RevGrayTRC);
 441     cmsPipelineFree(Lut);
 442     return NULL;
 443 }
 444
 445
 446 static
 447 cmsPipeline* BuildRGBOutputMatrixShaper(cmsHPROFILE hProfile)
 448 {
 449     cmsPipeline* Lut;
 450     cmsToneCurve *Shapes[3], *InvShapes[3];
 451     cmsMAT3 Mat, Inv;
 452     int i, j;
 453     cmsContext ContextID = cmsGetProfileContextID(hProfile);
 454
 455     if (!ReadICCMatrixRGB2XYZ(&Mat, hProfile))
 456         return NULL;
 457
 458     if (!_cmsMAT3inverse(&Mat, &Inv))
 459         return NULL;
 460
 461     // XYZ PCS in encoded in 1.15 format, and the matrix input should come in 0..0xffff range, so
 462     // we need to adjust the input by a << 1 to obtain a 1.16 fixed and then by a factor of
 463     // (0xffff/0x10000) to put data in 0..0xffff range. Total factor is (2.0*65535.0)/65536.0;
 464
 465     for (i=0; i < 3; i++)
 466         for (j=0; j < 3; j++)
 467             Inv.v[i].n[j] *= OutpAdj;
 468
 469     Shapes[0] = (cmsToneCurve *) cmsReadTag(hProfile, cmsSigRedTRCTag);
 470     Shapes[1] = (cmsToneCurve *) cmsReadTag(hProfile, cmsSigGreenTRCTag);
 471     Shapes[2] = (cmsToneCurve *) cmsReadTag(hProfile, cmsSigBlueTRCTag);
 472
 473     if (!Shapes[0] || !Shapes[1] || !Shapes[2])
 474         return NULL;
 475
 476     InvShapes[0] = cmsReverseToneCurve(Shapes[0]);
 477     InvShapes[1] = cmsReverseToneCurve(Shapes[1]);
 478     InvShapes[2] = cmsReverseToneCurve(Shapes[2]);
 479
 480     if (!InvShapes[0] || !InvShapes[1] || !InvShapes[2]) {
 481         return NULL;
 482     }
 483
 484     Lut = cmsPipelineAlloc(ContextID, 3, 3);
 485     if (Lut != NULL) {
 486
 487         // Note that it is certainly possible a single profile would have a LUT based
 488         // tag for output working in lab and a matrix-shaper for the fallback cases.
 489         // This is not allowed by the spec, but this code is tolerant to those cases
 490         if (cmsGetPCS(hProfile) == cmsSigLabData) {
 491
 492             if (!cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageAllocLab2XYZ(ContextID)))
 493                 goto Error;
 494         }
 495
 496         if (!cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocMatrix(ContextID, 3, 3, (cmsFloat64Number*) &Inv, NULL)) ||
 497             !cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocToneCurves(ContextID, 3, InvShapes)))
 498             goto Error;
 499     }
 500
 501     cmsFreeToneCurveTriple(InvShapes);
 502     return Lut;
 503 Error:
 504     cmsFreeToneCurveTriple(InvShapes);
 505     cmsPipelineFree(Lut);
 506     return NULL;
 507 }
 508
 509
 510 // Change CLUT interpolation to trilinear
 511 static
 512 void ChangeInterpolationToTrilinear(cmsPipeline* Lut)
 513 {
 514     cmsStage* Stage;
 515
 516     for (Stage = cmsPipelineGetPtrToFirstStage(Lut);
 517         Stage != NULL;
 518         Stage = cmsStageNext(Stage)) {
 519
 520             if (cmsStageType(Stage) == cmsSigCLutElemType) {
 521
 522                 _cmsStageCLutData* CLUT = (_cmsStageCLutData*) Stage ->Data;
 523
 524                 CLUT ->Params->dwFlags |= CMS_LERP_FLAGS_TRILINEAR;
 525                 _cmsSetInterpolationRoutine(CLUT ->Params);
 526             }
 527     }
 528 }
 529
 530
 531 // Read the DToAX tag, adjusting the encoding of Lab or XYZ if neded
 532 static
 533 cmsPipeline* _cmsReadFloatOutputTag(cmsHPROFILE hProfile, cmsTagSignature tagFloat)
 534 {
 535     cmsContext ContextID       = cmsGetProfileContextID(hProfile);
 536     cmsPipeline* Lut           = cmsPipelineDup((cmsPipeline*) cmsReadTag(hProfile, tagFloat));
 537     cmsColorSpaceSignature PCS = cmsGetPCS(hProfile);
 538     cmsColorSpaceSignature dataSpace = cmsGetColorSpace(hProfile);
 539
 540     if (Lut == NULL) return NULL;
 541
 542     // If PCS is Lab or XYZ, the floating point tag is accepting data in the space encoding,
 543     // and since the formatter has already accomodated to 0..1.0, we should undo this change
 544     if ( PCS == cmsSigLabData)
 545     {
 546         if (!cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageNormalizeToLabFloat(ContextID)))
 547             goto Error;
 548     }
 549     else
 550         if (PCS == cmsSigXYZData)
 551         {
 552             if (!cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageNormalizeToXyzFloat(ContextID)))
 553                 goto Error;
 554         }
 555
 556     // the output can be Lab or XYZ, in which case normalisation is needed on the end of the pipeline
 557     if ( dataSpace == cmsSigLabData)
 558     {
 559         if (!cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageNormalizeFromLabFloat(ContextID)))
 560             goto Error;
 561     }
 562     else if (dataSpace == cmsSigXYZData)
 563     {
 564         if (!cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageNormalizeFromXyzFloat(ContextID)))
 565             goto Error;
 566     }
 567
 568     return Lut;
 569
 570 Error:
 571     cmsPipelineFree(Lut);
 572     return NULL;
 573 }
 574
 575 // Create an output MPE LUT from agiven profile. Version mismatches are handled here
 576 cmsPipeline* _cmsReadOutputLUT(cmsHPROFILE hProfile, int Intent)
 577 {
 578     cmsTagTypeSignature OriginalType;
 579     cmsTagSignature tag16    = PCS2Device16[Intent];
 580     cmsTagSignature tagFloat = PCS2DeviceFloat[Intent];
 581     cmsContext ContextID     = cmsGetProfileContextID(hProfile);
 582
 583     if (cmsIsTag(hProfile, tagFloat)) {  // Float tag takes precedence
 584
 585         // Floating point LUT are always V4
 586         return _cmsReadFloatOutputTag(hProfile, tagFloat);
 587     }
 588
 589     // Revert to perceptual if no tag is found
 590     if (!cmsIsTag(hProfile, tag16)) {
 591         tag16 = PCS2Device16[0];
 592     }
 593
 594     if (cmsIsTag(hProfile, tag16)) { // Is there any LUT-Based table?
 595
 596         // Check profile version and LUT type. Do the necessary adjustments if needed
 597
 598         // First read the tag
 599         cmsPipeline* Lut = (cmsPipeline*) cmsReadTag(hProfile, tag16);
 600         if (Lut == NULL) return NULL;
 601
 602         // After reading it, we have info about the original type
 603         OriginalType =  _cmsGetTagTrueType(hProfile, tag16);
 604
 605         // The profile owns the Lut, so we need to copy it
 606         Lut = cmsPipelineDup(Lut);
 607         if (Lut == NULL) return NULL;
 608
 609         // Now it is time for a controversial stuff. I found that for 3D LUTS using
 610         // Lab used as indexer space,  trilinear interpolation should be used
 611         if (cmsGetPCS(hProfile) == cmsSigLabData)
 612             ChangeInterpolationToTrilinear(Lut);
 613
 614         // We need to adjust data only for Lab and Lut16 type
 615         if (OriginalType != cmsSigLut16Type || cmsGetPCS(hProfile) != cmsSigLabData)
 616             return Lut;
 617
 618         // Add a matrix for conversion V4 to V2 Lab PCS
 619         if (!cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageAllocLabV4ToV2(ContextID)))
 620             goto Error;
 621
 622         // If the output is Lab, add also a conversion at the end
 623         if (cmsGetColorSpace(hProfile) == cmsSigLabData)
 624             if (!cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageAllocLabV2ToV4(ContextID)))
 625                 goto Error;
 626
 627         return Lut;
 628 Error:
 629         cmsPipelineFree(Lut);
 630         return NULL;
 631     }
 632
 633     // Lut not found, try to create a matrix-shaper
 634
 635     // Check if this is a grayscale profile.
 636     if (cmsGetColorSpace(hProfile) == cmsSigGrayData) {
 637
 638         // if so, build appropiate conversion tables.
 639         // The tables are the PCS iluminant, scaled across GrayTRC
 640         return BuildGrayOutputPipeline(hProfile);
 641     }
 642
 643     // Not gray, create a normal matrix-shaper, which only operates in XYZ space
 644     return BuildRGBOutputMatrixShaper(hProfile);
 645 }
 646
 647 // ---------------------------------------------------------------------------------------------------------------
 648
 649 // Read the AToD0 tag, adjusting the encoding of Lab or XYZ if neded
 650 static
 651 cmsPipeline* _cmsReadFloatDevicelinkTag(cmsHPROFILE hProfile, cmsTagSignature tagFloat)
 652 {
 653     cmsContext ContextID       = cmsGetProfileContextID(hProfile);
 654     cmsPipeline* Lut           = cmsPipelineDup((cmsPipeline*) cmsReadTag(hProfile, tagFloat));
 655     cmsColorSpaceSignature PCS = cmsGetPCS(hProfile);
 656     cmsColorSpaceSignature spc = cmsGetColorSpace(hProfile);
 657
 658     if (Lut == NULL) return NULL;
 659
 660     if (spc == cmsSigLabData)
 661     {
 662         if (!cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageNormalizeToLabFloat(ContextID)))
 663             goto Error;
 664     }
 665     else
 666         if (spc == cmsSigXYZData)
 667         {
 668             if (!cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageNormalizeToXyzFloat(ContextID)))
 669                 goto Error;
 670         }
 671
 672         if (PCS == cmsSigLabData)
 673         {
 674             if (!cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageNormalizeFromLabFloat(ContextID)))
 675                 goto Error;
 676         }
 677         else
 678             if (PCS == cmsSigXYZData)
 679             {
 680                 if (!cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageNormalizeFromXyzFloat(ContextID)))
 681                     goto Error;
 682             }
 683
 684     return Lut;
 685 Error:
 686     cmsPipelineFree(Lut);
 687     return NULL;
 688 }
 689
 690 // This one includes abstract profiles as well. Matrix-shaper cannot be obtained on that device class. The
 691 // tag name here may default to AToB0
 692 cmsPipeline* _cmsReadDevicelinkLUT(cmsHPROFILE hProfile, int Intent)
 693 {
 694     cmsPipeline* Lut;
 695     cmsTagTypeSignature OriginalType;
 696     cmsTagSignature tag16    = Device2PCS16[Intent];
 697     cmsTagSignature tagFloat = Device2PCSFloat[Intent];
 698     cmsContext ContextID = cmsGetProfileContextID(hProfile);
 699
 700
 701     // On named color, take the appropiate tag
 702     if (cmsGetDeviceClass(hProfile) == cmsSigNamedColorClass) {
 703
 704         cmsNAMEDCOLORLIST* nc = (cmsNAMEDCOLORLIST*) cmsReadTag(hProfile, cmsSigNamedColor2Tag);
 705
 706         if (nc == NULL) return NULL;
 707
 708         Lut = cmsPipelineAlloc(ContextID, 0, 0);
 709         if (Lut == NULL)
 710             goto Error;
 711
 712         if (!cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageAllocNamedColor(nc, FALSE)))
 713             goto Error;
 714
 715         if (cmsGetColorSpace(hProfile) == cmsSigLabData)
 716             if (!cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageAllocLabV2ToV4(ContextID)))
 717                 goto Error;
 718
 719         return Lut;
 720 Error:
 721         cmsPipelineFree(Lut);
 722         cmsFreeNamedColorList(nc);
 723         return NULL;
 724     }
 725
 726     if (cmsIsTag(hProfile, tagFloat)) {  // Float tag takes precedence
 727
 728         // Floating point LUT are always V
 729         return _cmsReadFloatDevicelinkTag(hProfile, tagFloat);
 730     }
 731
 732     tagFloat = Device2PCSFloat[0];
 733     if (cmsIsTag(hProfile, tagFloat)) {
 734
 735         return cmsPipelineDup((cmsPipeline*) cmsReadTag(hProfile, tagFloat));
 736     }
 737
 738     if (!cmsIsTag(hProfile, tag16)) {  // Is there any LUT-Based table?
 739
 740         tag16    = Device2PCS16[0];
 741         if (!cmsIsTag(hProfile, tag16)) return NULL;
 742     }
 743
 744     // Check profile version and LUT type. Do the necessary adjustments if needed
 745
 746     // Read the tag
 747     Lut = (cmsPipeline*) cmsReadTag(hProfile, tag16);
 748     if (Lut == NULL) return NULL;
 749
 750     // The profile owns the Lut, so we need to copy it
 751     Lut = cmsPipelineDup(Lut);
 752     if (Lut == NULL) return NULL;
 753
 754     // Now it is time for a controversial stuff. I found that for 3D LUTS using
 755     // Lab used as indexer space,  trilinear interpolation should be used
 756     if (cmsGetColorSpace(hProfile) == cmsSigLabData)
 757         ChangeInterpolationToTrilinear(Lut);
 758
 759     // After reading it, we have info about the original type
 760     OriginalType =  _cmsGetTagTrueType(hProfile, tag16);
 761
 762     // We need to adjust data for Lab16 on output
 763     if (OriginalType != cmsSigLut16Type) return Lut;
 764
 765     // Here it is possible to get Lab on both sides
 766
 767     if (cmsGetPCS(hProfile) == cmsSigLabData) {
 768         if(!cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageAllocLabV4ToV2(ContextID)))
 769             goto Error2;
 770     }
 771
 772     if (cmsGetColorSpace(hProfile) == cmsSigLabData) {
 773         if(!cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageAllocLabV2ToV4(ContextID)))
 774             goto Error2;
 775     }
 776
 777     return Lut;
 778
 779 Error2:
 780     cmsPipelineFree(Lut);
 781     return NULL;
 782 }
 783
 784 // ---------------------------------------------------------------------------------------------------------------
 785
 786 // Returns TRUE if the profile is implemented as matrix-shaper
 787 cmsBool  CMSEXPORT cmsIsMatrixShaper(cmsHPROFILE hProfile)
 788 {
 789     switch (cmsGetColorSpace(hProfile)) {
 790
 791     case cmsSigGrayData:
 792
 793         return cmsIsTag(hProfile, cmsSigGrayTRCTag);
 794
 795     case cmsSigRgbData:
 796
 797         return (cmsIsTag(hProfile, cmsSigRedColorantTag) &&
 798                 cmsIsTag(hProfile, cmsSigGreenColorantTag) &&
 799                 cmsIsTag(hProfile, cmsSigBlueColorantTag) &&
 800                 cmsIsTag(hProfile, cmsSigRedTRCTag) &&
 801                 cmsIsTag(hProfile, cmsSigGreenTRCTag) &&
 802                 cmsIsTag(hProfile, cmsSigBlueTRCTag));
 803
 804     default:
 805
 806         return FALSE;
 807     }
 808 }
 809
 810 // Returns TRUE if the intent is implemented as CLUT
 811 cmsBool  CMSEXPORT cmsIsCLUT(cmsHPROFILE hProfile, cmsUInt32Number Intent, cmsUInt32Number UsedDirection)
 812 {
 813     const cmsTagSignature* TagTable;
 814
 815     // For devicelinks, the supported intent is that one stated in the header
 816     if (cmsGetDeviceClass(hProfile) == cmsSigLinkClass) {
 817             return (cmsGetHeaderRenderingIntent(hProfile) == Intent);
 818     }
 819
 820     switch (UsedDirection) {
 821
 822        case LCMS_USED_AS_INPUT: TagTable = Device2PCS16; break;
 823        case LCMS_USED_AS_OUTPUT:TagTable = PCS2Device16; break;
 824
 825        // For proofing, we need rel. colorimetric in output. Let's do some recursion
 826        case LCMS_USED_AS_PROOF:
 827            return cmsIsIntentSupported(hProfile, Intent, LCMS_USED_AS_INPUT) &&
 828                   cmsIsIntentSupported(hProfile, INTENT_RELATIVE_COLORIMETRIC, LCMS_USED_AS_OUTPUT);
 829
 830        default:
 831            cmsSignalError(cmsGetProfileContextID(hProfile), cmsERROR_RANGE, "Unexpected direction (%d)", UsedDirection);
 832            return FALSE;
 833     }
 834
 835     return cmsIsTag(hProfile, TagTable[Intent]);
 836
 837 }
 838
 839
 840 // Return info about supported intents
 841 cmsBool  CMSEXPORT cmsIsIntentSupported(cmsHPROFILE hProfile,
 842                                         cmsUInt32Number Intent, cmsUInt32Number UsedDirection)
 843 {
 844
 845     if (cmsIsCLUT(hProfile, Intent, UsedDirection)) return TRUE;
 846
 847     // Is there any matrix-shaper? If so, the intent is supported. This is a bit odd, since V2 matrix shaper
 848     // does not fully support relative colorimetric because they cannot deal with non-zero black points, but
 849     // many profiles claims that, and this is certainly not true for V4 profiles. Lets answer "yes" no matter
 850     // the accuracy would be less than optimal in rel.col and v2 case.
 851
 852     return cmsIsMatrixShaper(hProfile);
 853 }
 854
 855
 856 // ---------------------------------------------------------------------------------------------------------------
 857
 858 // Read both, profile sequence description and profile sequence id if present. Then combine both to
 859 // create qa unique structure holding both. Shame on ICC to store things in such complicated way.
 860 cmsSEQ* _cmsReadProfileSequence(cmsHPROFILE hProfile)
 861 {
 862     cmsSEQ* ProfileSeq;
 863     cmsSEQ* ProfileId;
 864     cmsSEQ* NewSeq;
 865     cmsUInt32Number i;
 866
 867     // Take profile sequence description first
 868     ProfileSeq = (cmsSEQ*) cmsReadTag(hProfile, cmsSigProfileSequenceDescTag);
 869
 870     // Take profile sequence ID
 871     ProfileId  = (cmsSEQ*) cmsReadTag(hProfile, cmsSigProfileSequenceIdTag);
 872
 873     if (ProfileSeq == NULL && ProfileId == NULL) return NULL;
 874
 875     if (ProfileSeq == NULL) return cmsDupProfileSequenceDescription(ProfileId);
 876     if (ProfileId  == NULL) return cmsDupProfileSequenceDescription(ProfileSeq);
 877
 878     // We have to mix both together. For that they must agree
 879     if (ProfileSeq ->n != ProfileId ->n) return cmsDupProfileSequenceDescription(ProfileSeq);
 880
 881     NewSeq = cmsDupProfileSequenceDescription(ProfileSeq);
 882
 883     // Ok, proceed to the mixing
 884     if (NewSeq != NULL) {
 885         for (i=0; i < ProfileSeq ->n; i++) {
 886
 887             memmove(&NewSeq ->seq[i].ProfileID, &ProfileId ->seq[i].ProfileID, sizeof(cmsProfileID));
 888             NewSeq ->seq[i].Description = cmsMLUdup(ProfileId ->seq[i].Description);
 889         }
 890     }
 891     return NewSeq;
 892 }
 893
 894 // Dump the contents of profile sequence in both tags (if v4 available)
 895 cmsBool _cmsWriteProfileSequence(cmsHPROFILE hProfile, const cmsSEQ* seq)
 896 {
 897     if (!cmsWriteTag(hProfile, cmsSigProfileSequenceDescTag, seq)) return FALSE;
 898
 899     if (cmsGetProfileVersion(hProfile) >= 4.0) {
 900
 901             if (!cmsWriteTag(hProfile, cmsSigProfileSequenceIdTag, seq)) return FALSE;
 902     }
 903
 904     return TRUE;
 905 }
 906
 907
 908 // Auxiliar, read and duplicate a MLU if found.
 909 static
 910 cmsMLU* GetMLUFromProfile(cmsHPROFILE h, cmsTagSignature sig)
 911 {
 912     cmsMLU* mlu = (cmsMLU*) cmsReadTag(h, sig);
 913     if (mlu == NULL) return NULL;
 914
 915     return cmsMLUdup(mlu);
 916 }
 917
 918 // Create a sequence description out of an array of profiles
 919 cmsSEQ* _cmsCompileProfileSequence(cmsContext ContextID, cmsUInt32Number nProfiles, cmsHPROFILE hProfiles[])
 920 {
 921     cmsUInt32Number i;
 922     cmsSEQ* seq = cmsAllocProfileSequenceDescription(ContextID, nProfiles);
 923
 924     if (seq == NULL) return NULL;
 925
 926     for (i=0; i < nProfiles; i++) {
 927
 928         cmsPSEQDESC* ps = &seq ->seq[i];
 929         cmsHPROFILE h = hProfiles[i];
 930         cmsTechnologySignature* techpt;
 931
 932         cmsGetHeaderAttributes(h, &ps ->attributes);
 933         cmsGetHeaderProfileID(h, ps ->ProfileID.ID8);
 934         ps ->deviceMfg   = cmsGetHeaderManufacturer(h);
 935         ps ->deviceModel = cmsGetHeaderModel(h);
 936
 937         techpt = (cmsTechnologySignature*) cmsReadTag(h, cmsSigTechnologyTag);
 938         if (techpt == NULL)
 939             ps ->technology   =  (cmsTechnologySignature) 0;
 940         else
 941             ps ->technology   = *techpt;
 942
 943         ps ->Manufacturer = GetMLUFromProfile(h,  cmsSigDeviceMfgDescTag);
 944         ps ->Model        = GetMLUFromProfile(h,  cmsSigDeviceModelDescTag);
 945         ps ->Description  = GetMLUFromProfile(h, cmsSigProfileDescriptionTag);
 946
 947     }
 948
 949     return seq;
 950 }
 951
 952 // -------------------------------------------------------------------------------------------------------------------
 953
 954
 955 static
 956 const cmsMLU* GetInfo(cmsHPROFILE hProfile, cmsInfoType Info)
 957 {
 958     cmsTagSignature sig;
 959
 960     switch (Info) {
 961
 962     case cmsInfoDescription:
 963         sig = cmsSigProfileDescriptionTag;
 964         break;
 965
 966     case cmsInfoManufacturer:
 967         sig = cmsSigDeviceMfgDescTag;
 968         break;
 969
 970     case cmsInfoModel:
 971         sig = cmsSigDeviceModelDescTag;
 972          break;
 973
 974     case cmsInfoCopyright:
 975         sig = cmsSigCopyrightTag;
 976         break;
 977
 978     default: return NULL;
 979     }
 980
 981
 982     return (cmsMLU*) cmsReadTag(hProfile, sig);
 983 }
 984
 985
 986
 987 cmsUInt32Number CMSEXPORT cmsGetProfileInfo(cmsHPROFILE hProfile, cmsInfoType Info,
 988                                             const char LanguageCode[3], const char CountryCode[3],
 989                                             wchar_t* Buffer, cmsUInt32Number BufferSize)
 990 {
 991     const cmsMLU* mlu = GetInfo(hProfile, Info);
 992     if (mlu == NULL) return 0;
 993
 994     return cmsMLUgetWide(mlu, LanguageCode, CountryCode, Buffer, BufferSize);
 995 }
 996
 997
 998 cmsUInt32Number  CMSEXPORT cmsGetProfileInfoASCII(cmsHPROFILE hProfile, cmsInfoType Info,
 999                                                           const char LanguageCode[3], const char CountryCode[3],
1000                                                           char* Buffer, cmsUInt32Number BufferSize)
1001 {
1002     const cmsMLU* mlu = GetInfo(hProfile, Info);
1003     if (mlu == NULL) return 0;
1004
1005     return cmsMLUgetASCII(mlu, LanguageCode, CountryCode, Buffer, BufferSize);
1006 }