1 //---------------------------------------------------------------------------------
3 // Little Color Management System
4 // Copyright (c) 1998-2012 Marti Maria Saguer
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:
13 // The above copyright notice and this permission notice shall be included in
14 // all copies or substantial portions of the Software.
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.
24 //---------------------------------------------------------------------------------
27 #include "lcms2_internal.h"
29 // Read tags using low-level functions, provides necessary glue code to adapt versions, etc.
32 static const cmsTagSignature Device2PCS16[] = {cmsSigAToB0Tag, // Perceptual
33 cmsSigAToB1Tag, // Relative colorimetric
34 cmsSigAToB2Tag, // Saturation
35 cmsSigAToB1Tag }; // Absolute colorimetric
37 static const cmsTagSignature Device2PCSFloat[] = {cmsSigDToB0Tag, // Perceptual
38 cmsSigDToB1Tag, // Relative colorimetric
39 cmsSigDToB2Tag, // Saturation
40 cmsSigDToB3Tag }; // Absolute colorimetric
42 static const cmsTagSignature PCS2Device16[] = {cmsSigBToA0Tag, // Perceptual
43 cmsSigBToA1Tag, // Relative colorimetric
44 cmsSigBToA2Tag, // Saturation
45 cmsSigBToA1Tag }; // Absolute colorimetric
47 static const cmsTagSignature PCS2DeviceFloat[] = {cmsSigBToD0Tag, // Perceptual
48 cmsSigBToD1Tag, // Relative colorimetric
49 cmsSigBToD2Tag, // Saturation
50 cmsSigBToD3Tag }; // Absolute colorimetric
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)
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 };
63 // Get a media white point fixing some issues found in certain old profiles
64 cmsBool _cmsReadMediaWhitePoint(cmsCIEXYZ* Dest, cmsHPROFILE hProfile)
68 _cmsAssert(Dest != NULL);
70 Tag = (cmsCIEXYZ*) cmsReadTag(hProfile, cmsSigMediaWhitePointTag);
74 *Dest = *cmsD50_XYZ();
78 // V2 display profiles should give D50
79 if (cmsGetEncodedICCversion(hProfile) < 0x4000000) {
81 if (cmsGetDeviceClass(hProfile) == cmsSigDisplayClass) {
82 *Dest = *cmsD50_XYZ();
93 // Chromatic adaptation matrix. Fix some issues as well
94 cmsBool _cmsReadCHAD(cmsMAT3* Dest, cmsHPROFILE hProfile)
98 _cmsAssert(Dest != NULL);
100 Tag = (cmsMAT3*) cmsReadTag(hProfile, cmsSigChromaticAdaptationTag);
107 // No CHAD available, default it to identity
108 _cmsMAT3identity(Dest);
110 // V2 display profiles should give D50
111 if (cmsGetEncodedICCversion(hProfile) < 0x4000000) {
113 if (cmsGetDeviceClass(hProfile) == cmsSigDisplayClass) {
115 cmsCIEXYZ* White = (cmsCIEXYZ*) cmsReadTag(hProfile, cmsSigMediaWhitePointTag);
119 _cmsMAT3identity(Dest);
123 return _cmsAdaptationMatrix(Dest, NULL, White, cmsD50_XYZ());
131 // Auxiliar, read colorants as a MAT3 structure. Used by any function that needs a matrix-shaper
133 cmsBool ReadICCMatrixRGB2XYZ(cmsMAT3* r, cmsHPROFILE hProfile)
135 cmsCIEXYZ *PtrRed, *PtrGreen, *PtrBlue;
137 _cmsAssert(r != NULL);
139 PtrRed = (cmsCIEXYZ *) cmsReadTag(hProfile, cmsSigRedColorantTag);
140 PtrGreen = (cmsCIEXYZ *) cmsReadTag(hProfile, cmsSigGreenColorantTag);
141 PtrBlue = (cmsCIEXYZ *) cmsReadTag(hProfile, cmsSigBlueColorantTag);
143 if (PtrRed == NULL || PtrGreen == NULL || PtrBlue == NULL)
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);
154 // Gray input pipeline
156 cmsPipeline* BuildGrayInputMatrixPipeline(cmsHPROFILE hProfile)
158 cmsToneCurve *GrayTRC;
160 cmsContext ContextID = cmsGetProfileContextID(hProfile);
162 GrayTRC = (cmsToneCurve *) cmsReadTag(hProfile, cmsSigGrayTRCTag);
163 if (GrayTRC == NULL) return NULL;
165 Lut = cmsPipelineAlloc(ContextID, 1, 3);
169 if (cmsGetPCS(hProfile) == cmsSigLabData) {
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];
176 EmptyTab = cmsBuildTabulatedToneCurve16(ContextID, 2, Zero);
178 if (EmptyTab == NULL)
181 LabCurves[0] = GrayTRC;
182 LabCurves[1] = EmptyTab;
183 LabCurves[2] = EmptyTab;
185 if (!cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocMatrix(ContextID, 3, 1, OneToThreeInputMatrix, NULL)) ||
186 !cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocToneCurves(ContextID, 3, LabCurves))) {
187 cmsFreeToneCurve(EmptyTab);
191 cmsFreeToneCurve(EmptyTab);
196 if (!cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocToneCurves(ContextID, 1, &GrayTRC)) ||
197 !cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocMatrix(ContextID, 3, 1, GrayInputMatrix, NULL)))
204 cmsFreeToneCurve(GrayTRC);
205 cmsPipelineFree(Lut);
211 cmsPipeline* BuildRGBInputMatrixShaper(cmsHPROFILE hProfile)
215 cmsToneCurve *Shapes[3];
216 cmsContext ContextID = cmsGetProfileContextID(hProfile);
219 if (!ReadICCMatrixRGB2XYZ(&Mat, hProfile)) return NULL;
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)
225 for (i=0; i < 3; i++)
226 for (j=0; j < 3; j++)
227 Mat.v[i].n[j] *= InpAdj;
230 Shapes[0] = (cmsToneCurve *) cmsReadTag(hProfile, cmsSigRedTRCTag);
231 Shapes[1] = (cmsToneCurve *) cmsReadTag(hProfile, cmsSigGreenTRCTag);
232 Shapes[2] = (cmsToneCurve *) cmsReadTag(hProfile, cmsSigBlueTRCTag);
234 if (!Shapes[0] || !Shapes[1] || !Shapes[2])
237 Lut = cmsPipelineAlloc(ContextID, 3, 3);
240 if (!cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocToneCurves(ContextID, 3, Shapes)) ||
241 !cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocMatrix(ContextID, 3, 3, (cmsFloat64Number*) &Mat, NULL)))
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) {
249 if (!cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageAllocXYZ2Lab(ContextID)))
258 cmsPipelineFree(Lut);
264 // Read the DToAX tag, adjusting the encoding of Lab or XYZ if neded
266 cmsPipeline* _cmsReadFloatInputTag(cmsHPROFILE hProfile, cmsTagSignature tagFloat)
268 cmsContext ContextID = cmsGetProfileContextID(hProfile);
269 cmsPipeline* Lut = cmsPipelineDup((cmsPipeline*) cmsReadTag(hProfile, tagFloat));
270 cmsColorSpaceSignature spc = cmsGetColorSpace(hProfile);
271 cmsColorSpaceSignature PCS = cmsGetPCS(hProfile);
273 if (Lut == NULL) return NULL;
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)
279 if (!cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageNormalizeToLabFloat(ContextID)))
282 else if (spc == cmsSigXYZData)
284 if (!cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageNormalizeToXyzFloat(ContextID)))
288 if ( PCS == cmsSigLabData)
290 if (!cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageNormalizeFromLabFloat(ContextID)))
293 else if( PCS == cmsSigXYZData)
295 if (!cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageNormalizeFromXyzFloat(ContextID)))
302 cmsPipelineFree(Lut);
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 // We add intent = -1 as a way to read matrix shaper always, no matter of other LUT
310 cmsPipeline* _cmsReadInputLUT(cmsHPROFILE hProfile, int Intent)
312 cmsTagTypeSignature OriginalType;
313 cmsTagSignature tag16 = Device2PCS16[Intent];
314 cmsTagSignature tagFloat = Device2PCSFloat[Intent];
315 cmsContext ContextID = cmsGetProfileContextID(hProfile);
317 // On named color, take the appropiate tag
318 if (cmsGetDeviceClass(hProfile) == cmsSigNamedColorClass) {
321 cmsNAMEDCOLORLIST* nc = (cmsNAMEDCOLORLIST*) cmsReadTag(hProfile, cmsSigNamedColor2Tag);
323 if (nc == NULL) return NULL;
325 Lut = cmsPipelineAlloc(ContextID, 0, 0);
327 cmsFreeNamedColorList(nc);
331 if (!cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageAllocNamedColor(nc, TRUE)) ||
332 !cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageAllocLabV2ToV4(ContextID))) {
333 cmsPipelineFree(Lut);
339 // This is an attempt to reuse this funtion to retrieve the matrix-shaper as pipeline no
340 // matter other LUT are present and have precedence. Intent = -1 means just this.
343 if (cmsIsTag(hProfile, tagFloat)) { // Float tag takes precedence
345 // Floating point LUT are always V4, but the encoding range is no
346 // longer 0..1.0, so we need to add an stage depending on the color space
347 return _cmsReadFloatInputTag(hProfile, tagFloat);
350 // Revert to perceptual if no tag is found
351 if (!cmsIsTag(hProfile, tag16)) {
352 tag16 = Device2PCS16[0];
355 if (cmsIsTag(hProfile, tag16)) { // Is there any LUT-Based table?
357 // Check profile version and LUT type. Do the necessary adjustments if needed
359 // First read the tag
360 cmsPipeline* Lut = (cmsPipeline*) cmsReadTag(hProfile, tag16);
361 if (Lut == NULL) return NULL;
363 // After reading it, we have now info about the original type
364 OriginalType = _cmsGetTagTrueType(hProfile, tag16);
366 // The profile owns the Lut, so we need to copy it
367 Lut = cmsPipelineDup(Lut);
369 // We need to adjust data only for Lab16 on output
370 if (OriginalType != cmsSigLut16Type || cmsGetPCS(hProfile) != cmsSigLabData)
373 // If the input is Lab, add also a conversion at the begin
374 if (cmsGetColorSpace(hProfile) == cmsSigLabData &&
375 !cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageAllocLabV4ToV2(ContextID)))
378 // Add a matrix for conversion V2 to V4 Lab PCS
379 if (!cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageAllocLabV2ToV4(ContextID)))
384 cmsPipelineFree(Lut);
389 // Lut was not found, try to create a matrix-shaper
391 // Check if this is a grayscale profile.
392 if (cmsGetColorSpace(hProfile) == cmsSigGrayData) {
394 // if so, build appropiate conversion tables.
395 // The tables are the PCS iluminant, scaled across GrayTRC
396 return BuildGrayInputMatrixPipeline(hProfile);
399 // Not gray, create a normal matrix-shaper
400 return BuildRGBInputMatrixShaper(hProfile);
403 // ---------------------------------------------------------------------------------------------------------------
405 // Gray output pipeline.
406 // XYZ -> Gray or Lab -> Gray. Since we only know the GrayTRC, we need to do some assumptions. Gray component will be
407 // given by Y on XYZ PCS and by L* on Lab PCS, Both across inverse TRC curve.
408 // The complete pipeline on XYZ is Matrix[3:1] -> Tone curve and in Lab Matrix[3:1] -> Tone Curve as well.
411 cmsPipeline* BuildGrayOutputPipeline(cmsHPROFILE hProfile)
413 cmsToneCurve *GrayTRC, *RevGrayTRC;
415 cmsContext ContextID = cmsGetProfileContextID(hProfile);
417 GrayTRC = (cmsToneCurve *) cmsReadTag(hProfile, cmsSigGrayTRCTag);
418 if (GrayTRC == NULL) return NULL;
420 RevGrayTRC = cmsReverseToneCurve(GrayTRC);
421 if (RevGrayTRC == NULL) return NULL;
423 Lut = cmsPipelineAlloc(ContextID, 3, 1);
425 cmsFreeToneCurve(RevGrayTRC);
429 if (cmsGetPCS(hProfile) == cmsSigLabData) {
431 if (!cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocMatrix(ContextID, 1, 3, PickLstarMatrix, NULL)))
435 if (!cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocMatrix(ContextID, 1, 3, PickYMatrix, NULL)))
439 if (!cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocToneCurves(ContextID, 1, &RevGrayTRC)))
442 cmsFreeToneCurve(RevGrayTRC);
446 cmsFreeToneCurve(RevGrayTRC);
447 cmsPipelineFree(Lut);
453 cmsPipeline* BuildRGBOutputMatrixShaper(cmsHPROFILE hProfile)
456 cmsToneCurve *Shapes[3], *InvShapes[3];
459 cmsContext ContextID = cmsGetProfileContextID(hProfile);
461 if (!ReadICCMatrixRGB2XYZ(&Mat, hProfile))
464 if (!_cmsMAT3inverse(&Mat, &Inv))
467 // XYZ PCS in encoded in 1.15 format, and the matrix input should come in 0..0xffff range, so
468 // we need to adjust the input by a << 1 to obtain a 1.16 fixed and then by a factor of
469 // (0xffff/0x10000) to put data in 0..0xffff range. Total factor is (2.0*65535.0)/65536.0;
471 for (i=0; i < 3; i++)
472 for (j=0; j < 3; j++)
473 Inv.v[i].n[j] *= OutpAdj;
475 Shapes[0] = (cmsToneCurve *) cmsReadTag(hProfile, cmsSigRedTRCTag);
476 Shapes[1] = (cmsToneCurve *) cmsReadTag(hProfile, cmsSigGreenTRCTag);
477 Shapes[2] = (cmsToneCurve *) cmsReadTag(hProfile, cmsSigBlueTRCTag);
479 if (!Shapes[0] || !Shapes[1] || !Shapes[2])
482 InvShapes[0] = cmsReverseToneCurve(Shapes[0]);
483 InvShapes[1] = cmsReverseToneCurve(Shapes[1]);
484 InvShapes[2] = cmsReverseToneCurve(Shapes[2]);
486 if (!InvShapes[0] || !InvShapes[1] || !InvShapes[2]) {
490 Lut = cmsPipelineAlloc(ContextID, 3, 3);
493 // Note that it is certainly possible a single profile would have a LUT based
494 // tag for output working in lab and a matrix-shaper for the fallback cases.
495 // This is not allowed by the spec, but this code is tolerant to those cases
496 if (cmsGetPCS(hProfile) == cmsSigLabData) {
498 if (!cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageAllocLab2XYZ(ContextID)))
502 if (!cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocMatrix(ContextID, 3, 3, (cmsFloat64Number*) &Inv, NULL)) ||
503 !cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocToneCurves(ContextID, 3, InvShapes)))
507 cmsFreeToneCurveTriple(InvShapes);
510 cmsFreeToneCurveTriple(InvShapes);
511 cmsPipelineFree(Lut);
516 // Change CLUT interpolation to trilinear
518 void ChangeInterpolationToTrilinear(cmsPipeline* Lut)
522 for (Stage = cmsPipelineGetPtrToFirstStage(Lut);
524 Stage = cmsStageNext(Stage)) {
526 if (cmsStageType(Stage) == cmsSigCLutElemType) {
528 _cmsStageCLutData* CLUT = (_cmsStageCLutData*) Stage ->Data;
530 CLUT ->Params->dwFlags |= CMS_LERP_FLAGS_TRILINEAR;
531 _cmsSetInterpolationRoutine(Lut->ContextID, CLUT ->Params);
537 // Read the DToAX tag, adjusting the encoding of Lab or XYZ if neded
539 cmsPipeline* _cmsReadFloatOutputTag(cmsHPROFILE hProfile, cmsTagSignature tagFloat)
541 cmsContext ContextID = cmsGetProfileContextID(hProfile);
542 cmsPipeline* Lut = cmsPipelineDup((cmsPipeline*) cmsReadTag(hProfile, tagFloat));
543 cmsColorSpaceSignature PCS = cmsGetPCS(hProfile);
544 cmsColorSpaceSignature dataSpace = cmsGetColorSpace(hProfile);
546 if (Lut == NULL) return NULL;
548 // If PCS is Lab or XYZ, the floating point tag is accepting data in the space encoding,
549 // and since the formatter has already accomodated to 0..1.0, we should undo this change
550 if ( PCS == cmsSigLabData)
552 if (!cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageNormalizeToLabFloat(ContextID)))
556 if (PCS == cmsSigXYZData)
558 if (!cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageNormalizeToXyzFloat(ContextID)))
562 // the output can be Lab or XYZ, in which case normalisation is needed on the end of the pipeline
563 if ( dataSpace == cmsSigLabData)
565 if (!cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageNormalizeFromLabFloat(ContextID)))
568 else if (dataSpace == cmsSigXYZData)
570 if (!cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageNormalizeFromXyzFloat(ContextID)))
577 cmsPipelineFree(Lut);
581 // Create an output MPE LUT from agiven profile. Version mismatches are handled here
582 cmsPipeline* _cmsReadOutputLUT(cmsHPROFILE hProfile, int Intent)
584 cmsTagTypeSignature OriginalType;
585 cmsTagSignature tag16 = PCS2Device16[Intent];
586 cmsTagSignature tagFloat = PCS2DeviceFloat[Intent];
587 cmsContext ContextID = cmsGetProfileContextID(hProfile);
592 if (cmsIsTag(hProfile, tagFloat)) { // Float tag takes precedence
594 // Floating point LUT are always V4
595 return _cmsReadFloatOutputTag(hProfile, tagFloat);
598 // Revert to perceptual if no tag is found
599 if (!cmsIsTag(hProfile, tag16)) {
600 tag16 = PCS2Device16[0];
603 if (cmsIsTag(hProfile, tag16)) { // Is there any LUT-Based table?
605 // Check profile version and LUT type. Do the necessary adjustments if needed
607 // First read the tag
608 cmsPipeline* Lut = (cmsPipeline*) cmsReadTag(hProfile, tag16);
609 if (Lut == NULL) return NULL;
611 // After reading it, we have info about the original type
612 OriginalType = _cmsGetTagTrueType(hProfile, tag16);
614 // The profile owns the Lut, so we need to copy it
615 Lut = cmsPipelineDup(Lut);
616 if (Lut == NULL) return NULL;
618 // Now it is time for a controversial stuff. I found that for 3D LUTS using
619 // Lab used as indexer space, trilinear interpolation should be used
620 if (cmsGetPCS(hProfile) == cmsSigLabData)
621 ChangeInterpolationToTrilinear(Lut);
623 // We need to adjust data only for Lab and Lut16 type
624 if (OriginalType != cmsSigLut16Type || cmsGetPCS(hProfile) != cmsSigLabData)
627 // Add a matrix for conversion V4 to V2 Lab PCS
628 if (!cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageAllocLabV4ToV2(ContextID)))
631 // If the output is Lab, add also a conversion at the end
632 if (cmsGetColorSpace(hProfile) == cmsSigLabData)
633 if (!cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageAllocLabV2ToV4(ContextID)))
638 cmsPipelineFree(Lut);
643 // Lut not found, try to create a matrix-shaper
645 // Check if this is a grayscale profile.
646 if (cmsGetColorSpace(hProfile) == cmsSigGrayData) {
648 // if so, build appropiate conversion tables.
649 // The tables are the PCS iluminant, scaled across GrayTRC
650 return BuildGrayOutputPipeline(hProfile);
653 // Not gray, create a normal matrix-shaper, which only operates in XYZ space
654 return BuildRGBOutputMatrixShaper(hProfile);
657 // ---------------------------------------------------------------------------------------------------------------
659 // Read the AToD0 tag, adjusting the encoding of Lab or XYZ if neded
661 cmsPipeline* _cmsReadFloatDevicelinkTag(cmsHPROFILE hProfile, cmsTagSignature tagFloat)
663 cmsContext ContextID = cmsGetProfileContextID(hProfile);
664 cmsPipeline* Lut = cmsPipelineDup((cmsPipeline*) cmsReadTag(hProfile, tagFloat));
665 cmsColorSpaceSignature PCS = cmsGetPCS(hProfile);
666 cmsColorSpaceSignature spc = cmsGetColorSpace(hProfile);
668 if (Lut == NULL) return NULL;
670 if (spc == cmsSigLabData)
672 if (!cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageNormalizeToLabFloat(ContextID)))
676 if (spc == cmsSigXYZData)
678 if (!cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageNormalizeToXyzFloat(ContextID)))
682 if (PCS == cmsSigLabData)
684 if (!cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageNormalizeFromLabFloat(ContextID)))
688 if (PCS == cmsSigXYZData)
690 if (!cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageNormalizeFromXyzFloat(ContextID)))
696 cmsPipelineFree(Lut);
700 // This one includes abstract profiles as well. Matrix-shaper cannot be obtained on that device class. The
701 // tag name here may default to AToB0
702 cmsPipeline* _cmsReadDevicelinkLUT(cmsHPROFILE hProfile, int Intent)
705 cmsTagTypeSignature OriginalType;
706 cmsTagSignature tag16 = Device2PCS16[Intent];
707 cmsTagSignature tagFloat = Device2PCSFloat[Intent];
708 cmsContext ContextID = cmsGetProfileContextID(hProfile);
711 // On named color, take the appropiate tag
712 if (cmsGetDeviceClass(hProfile) == cmsSigNamedColorClass) {
714 cmsNAMEDCOLORLIST* nc = (cmsNAMEDCOLORLIST*) cmsReadTag(hProfile, cmsSigNamedColor2Tag);
716 if (nc == NULL) return NULL;
718 Lut = cmsPipelineAlloc(ContextID, 0, 0);
722 if (!cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageAllocNamedColor(nc, FALSE)))
725 if (cmsGetColorSpace(hProfile) == cmsSigLabData)
726 if (!cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageAllocLabV2ToV4(ContextID)))
731 cmsPipelineFree(Lut);
732 cmsFreeNamedColorList(nc);
736 if (cmsIsTag(hProfile, tagFloat)) { // Float tag takes precedence
738 // Floating point LUT are always V
739 return _cmsReadFloatDevicelinkTag(hProfile, tagFloat);
742 tagFloat = Device2PCSFloat[0];
743 if (cmsIsTag(hProfile, tagFloat)) {
745 return cmsPipelineDup((cmsPipeline*) cmsReadTag(hProfile, tagFloat));
748 if (!cmsIsTag(hProfile, tag16)) { // Is there any LUT-Based table?
750 tag16 = Device2PCS16[0];
751 if (!cmsIsTag(hProfile, tag16)) return NULL;
754 // Check profile version and LUT type. Do the necessary adjustments if needed
757 Lut = (cmsPipeline*) cmsReadTag(hProfile, tag16);
758 if (Lut == NULL) return NULL;
760 // The profile owns the Lut, so we need to copy it
761 Lut = cmsPipelineDup(Lut);
762 if (Lut == NULL) return NULL;
764 // Now it is time for a controversial stuff. I found that for 3D LUTS using
765 // Lab used as indexer space, trilinear interpolation should be used
766 if (cmsGetPCS(hProfile) == cmsSigLabData)
767 ChangeInterpolationToTrilinear(Lut);
769 // After reading it, we have info about the original type
770 OriginalType = _cmsGetTagTrueType(hProfile, tag16);
772 // We need to adjust data for Lab16 on output
773 if (OriginalType != cmsSigLut16Type) return Lut;
775 // Here it is possible to get Lab on both sides
777 if (cmsGetColorSpace(hProfile) == cmsSigLabData) {
778 if(!cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageAllocLabV4ToV2(ContextID)))
782 if (cmsGetPCS(hProfile) == cmsSigLabData) {
783 if(!cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageAllocLabV2ToV4(ContextID)))
790 cmsPipelineFree(Lut);
794 // ---------------------------------------------------------------------------------------------------------------
796 // Returns TRUE if the profile is implemented as matrix-shaper
797 cmsBool CMSEXPORT cmsIsMatrixShaper(cmsHPROFILE hProfile)
799 switch (cmsGetColorSpace(hProfile)) {
803 return cmsIsTag(hProfile, cmsSigGrayTRCTag);
807 return (cmsIsTag(hProfile, cmsSigRedColorantTag) &&
808 cmsIsTag(hProfile, cmsSigGreenColorantTag) &&
809 cmsIsTag(hProfile, cmsSigBlueColorantTag) &&
810 cmsIsTag(hProfile, cmsSigRedTRCTag) &&
811 cmsIsTag(hProfile, cmsSigGreenTRCTag) &&
812 cmsIsTag(hProfile, cmsSigBlueTRCTag));
820 // Returns TRUE if the intent is implemented as CLUT
821 cmsBool CMSEXPORT cmsIsCLUT(cmsHPROFILE hProfile, cmsUInt32Number Intent, cmsUInt32Number UsedDirection)
823 const cmsTagSignature* TagTable;
825 // For devicelinks, the supported intent is that one stated in the header
826 if (cmsGetDeviceClass(hProfile) == cmsSigLinkClass) {
827 return (cmsGetHeaderRenderingIntent(hProfile) == Intent);
830 switch (UsedDirection) {
832 case LCMS_USED_AS_INPUT: TagTable = Device2PCS16; break;
833 case LCMS_USED_AS_OUTPUT:TagTable = PCS2Device16; break;
835 // For proofing, we need rel. colorimetric in output. Let's do some recursion
836 case LCMS_USED_AS_PROOF:
837 return cmsIsIntentSupported(hProfile, Intent, LCMS_USED_AS_INPUT) &&
838 cmsIsIntentSupported(hProfile, INTENT_RELATIVE_COLORIMETRIC, LCMS_USED_AS_OUTPUT);
841 cmsSignalError(cmsGetProfileContextID(hProfile), cmsERROR_RANGE, "Unexpected direction (%d)", UsedDirection);
845 return cmsIsTag(hProfile, TagTable[Intent]);
850 // Return info about supported intents
851 cmsBool CMSEXPORT cmsIsIntentSupported(cmsHPROFILE hProfile,
852 cmsUInt32Number Intent, cmsUInt32Number UsedDirection)
855 if (cmsIsCLUT(hProfile, Intent, UsedDirection)) return TRUE;
857 // Is there any matrix-shaper? If so, the intent is supported. This is a bit odd, since V2 matrix shaper
858 // does not fully support relative colorimetric because they cannot deal with non-zero black points, but
859 // many profiles claims that, and this is certainly not true for V4 profiles. Lets answer "yes" no matter
860 // the accuracy would be less than optimal in rel.col and v2 case.
862 return cmsIsMatrixShaper(hProfile);
866 // ---------------------------------------------------------------------------------------------------------------
868 // Read both, profile sequence description and profile sequence id if present. Then combine both to
869 // create qa unique structure holding both. Shame on ICC to store things in such complicated way.
870 cmsSEQ* _cmsReadProfileSequence(cmsHPROFILE hProfile)
877 // Take profile sequence description first
878 ProfileSeq = (cmsSEQ*) cmsReadTag(hProfile, cmsSigProfileSequenceDescTag);
880 // Take profile sequence ID
881 ProfileId = (cmsSEQ*) cmsReadTag(hProfile, cmsSigProfileSequenceIdTag);
883 if (ProfileSeq == NULL && ProfileId == NULL) return NULL;
885 if (ProfileSeq == NULL) return cmsDupProfileSequenceDescription(ProfileId);
886 if (ProfileId == NULL) return cmsDupProfileSequenceDescription(ProfileSeq);
888 // We have to mix both together. For that they must agree
889 if (ProfileSeq ->n != ProfileId ->n) return cmsDupProfileSequenceDescription(ProfileSeq);
891 NewSeq = cmsDupProfileSequenceDescription(ProfileSeq);
893 // Ok, proceed to the mixing
894 if (NewSeq != NULL) {
895 for (i=0; i < ProfileSeq ->n; i++) {
897 memmove(&NewSeq ->seq[i].ProfileID, &ProfileId ->seq[i].ProfileID, sizeof(cmsProfileID));
898 NewSeq ->seq[i].Description = cmsMLUdup(ProfileId ->seq[i].Description);
904 // Dump the contents of profile sequence in both tags (if v4 available)
905 cmsBool _cmsWriteProfileSequence(cmsHPROFILE hProfile, const cmsSEQ* seq)
907 if (!cmsWriteTag(hProfile, cmsSigProfileSequenceDescTag, seq)) return FALSE;
909 if (cmsGetProfileVersion(hProfile) >= 4.0) {
911 if (!cmsWriteTag(hProfile, cmsSigProfileSequenceIdTag, seq)) return FALSE;
918 // Auxiliar, read and duplicate a MLU if found.
920 cmsMLU* GetMLUFromProfile(cmsHPROFILE h, cmsTagSignature sig)
922 cmsMLU* mlu = (cmsMLU*) cmsReadTag(h, sig);
923 if (mlu == NULL) return NULL;
925 return cmsMLUdup(mlu);
928 // Create a sequence description out of an array of profiles
929 cmsSEQ* _cmsCompileProfileSequence(cmsContext ContextID, cmsUInt32Number nProfiles, cmsHPROFILE hProfiles[])
932 cmsSEQ* seq = cmsAllocProfileSequenceDescription(ContextID, nProfiles);
934 if (seq == NULL) return NULL;
936 for (i=0; i < nProfiles; i++) {
938 cmsPSEQDESC* ps = &seq ->seq[i];
939 cmsHPROFILE h = hProfiles[i];
940 cmsTechnologySignature* techpt;
942 cmsGetHeaderAttributes(h, &ps ->attributes);
943 cmsGetHeaderProfileID(h, ps ->ProfileID.ID8);
944 ps ->deviceMfg = cmsGetHeaderManufacturer(h);
945 ps ->deviceModel = cmsGetHeaderModel(h);
947 techpt = (cmsTechnologySignature*) cmsReadTag(h, cmsSigTechnologyTag);
949 ps ->technology = (cmsTechnologySignature) 0;
951 ps ->technology = *techpt;
953 ps ->Manufacturer = GetMLUFromProfile(h, cmsSigDeviceMfgDescTag);
954 ps ->Model = GetMLUFromProfile(h, cmsSigDeviceModelDescTag);
955 ps ->Description = GetMLUFromProfile(h, cmsSigProfileDescriptionTag);
962 // -------------------------------------------------------------------------------------------------------------------
966 const cmsMLU* GetInfo(cmsHPROFILE hProfile, cmsInfoType Info)
972 case cmsInfoDescription:
973 sig = cmsSigProfileDescriptionTag;
976 case cmsInfoManufacturer:
977 sig = cmsSigDeviceMfgDescTag;
981 sig = cmsSigDeviceModelDescTag;
984 case cmsInfoCopyright:
985 sig = cmsSigCopyrightTag;
988 default: return NULL;
992 return (cmsMLU*) cmsReadTag(hProfile, sig);
997 cmsUInt32Number CMSEXPORT cmsGetProfileInfo(cmsHPROFILE hProfile, cmsInfoType Info,
998 const char LanguageCode[3], const char CountryCode[3],
999 wchar_t* Buffer, cmsUInt32Number BufferSize)
1001 const cmsMLU* mlu = GetInfo(hProfile, Info);
1002 if (mlu == NULL) return 0;
1004 return cmsMLUgetWide(mlu, LanguageCode, CountryCode, Buffer, BufferSize);
1008 cmsUInt32Number CMSEXPORT cmsGetProfileInfoASCII(cmsHPROFILE hProfile, cmsInfoType Info,
1009 const char LanguageCode[3], const char CountryCode[3],
1010 char* Buffer, cmsUInt32Number BufferSize)
1012 const cmsMLU* mlu = GetInfo(hProfile, Info);
1013 if (mlu == NULL) return 0;
1015 return cmsMLUgetASCII(mlu, LanguageCode, CountryCode, Buffer, BufferSize);