//--------------------------------------------------------------------------------- // // Little Color Management System // Copyright (c) 1998-2016 Marti Maria Saguer // // Permission is hereby granted, free of charge, to any person obtaining // a copy of this software and associated documentation files (the "Software"), // to deal in the Software without restriction, including without limitation // the rights to use, copy, modify, merge, publish, distribute, sublicense, // and/or sell copies of the Software, and to permit persons to whom the Software // is furnished to do so, subject to the following conditions: // // The above copyright notice and this permission notice shall be included in // all copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO // THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. // //--------------------------------------------------------------------------------- // #include "lcms2_internal.h" // Read tags using low-level functions, provides necessary glue code to adapt versions, etc. // LUT tags static const cmsTagSignature Device2PCS16[] = {cmsSigAToB0Tag, // Perceptual cmsSigAToB1Tag, // Relative colorimetric cmsSigAToB2Tag, // Saturation cmsSigAToB1Tag }; // Absolute colorimetric static const cmsTagSignature Device2PCSFloat[] = {cmsSigDToB0Tag, // Perceptual cmsSigDToB1Tag, // Relative colorimetric cmsSigDToB2Tag, // Saturation cmsSigDToB3Tag }; // Absolute colorimetric static const cmsTagSignature PCS2Device16[] = {cmsSigBToA0Tag, // Perceptual cmsSigBToA1Tag, // Relative colorimetric cmsSigBToA2Tag, // Saturation cmsSigBToA1Tag }; // Absolute colorimetric static const cmsTagSignature PCS2DeviceFloat[] = {cmsSigBToD0Tag, // Perceptual cmsSigBToD1Tag, // Relative colorimetric cmsSigBToD2Tag, // Saturation cmsSigBToD3Tag }; // Absolute colorimetric // Factors to convert from 1.15 fixed point to 0..1.0 range and vice-versa #define InpAdj (1.0/MAX_ENCODEABLE_XYZ) // (65536.0/(65535.0*2.0)) #define OutpAdj (MAX_ENCODEABLE_XYZ) // ((2.0*65535.0)/65536.0) // Several resources for gray conversions. static const cmsFloat64Number GrayInputMatrix[] = { (InpAdj*cmsD50X), (InpAdj*cmsD50Y), (InpAdj*cmsD50Z) }; static const cmsFloat64Number OneToThreeInputMatrix[] = { 1, 1, 1 }; static const cmsFloat64Number PickYMatrix[] = { 0, (OutpAdj*cmsD50Y), 0 }; static const cmsFloat64Number PickLstarMatrix[] = { 1, 0, 0 }; // Get a media white point fixing some issues found in certain old profiles cmsBool _cmsReadMediaWhitePoint(cmsCIEXYZ* Dest, cmsHPROFILE hProfile) { cmsCIEXYZ* Tag; _cmsAssert(Dest != NULL); Tag = (cmsCIEXYZ*) cmsReadTag(hProfile, cmsSigMediaWhitePointTag); // If no wp, take D50 if (Tag == NULL) { *Dest = *cmsD50_XYZ(); return TRUE; } // V2 display profiles should give D50 if (cmsGetEncodedICCversion(hProfile) < 0x4000000) { if (cmsGetDeviceClass(hProfile) == cmsSigDisplayClass) { *Dest = *cmsD50_XYZ(); return TRUE; } } // All seems ok *Dest = *Tag; return TRUE; } // Chromatic adaptation matrix. Fix some issues as well cmsBool _cmsReadCHAD(cmsMAT3* Dest, cmsHPROFILE hProfile) { cmsMAT3* Tag; _cmsAssert(Dest != NULL); Tag = (cmsMAT3*) cmsReadTag(hProfile, cmsSigChromaticAdaptationTag); if (Tag != NULL) { *Dest = *Tag; return TRUE; } // No CHAD available, default it to identity _cmsMAT3identity(Dest); // V2 display profiles should give D50 if (cmsGetEncodedICCversion(hProfile) < 0x4000000) { if (cmsGetDeviceClass(hProfile) == cmsSigDisplayClass) { cmsCIEXYZ* White = (cmsCIEXYZ*) cmsReadTag(hProfile, cmsSigMediaWhitePointTag); if (White == NULL) { _cmsMAT3identity(Dest); return TRUE; } return _cmsAdaptationMatrix(Dest, NULL, White, cmsD50_XYZ()); } } return TRUE; } // Auxiliary, read colorants as a MAT3 structure. Used by any function that needs a matrix-shaper static cmsBool ReadICCMatrixRGB2XYZ(cmsMAT3* r, cmsHPROFILE hProfile) { cmsCIEXYZ *PtrRed, *PtrGreen, *PtrBlue; _cmsAssert(r != NULL); PtrRed = (cmsCIEXYZ *) cmsReadTag(hProfile, cmsSigRedColorantTag); PtrGreen = (cmsCIEXYZ *) cmsReadTag(hProfile, cmsSigGreenColorantTag); PtrBlue = (cmsCIEXYZ *) cmsReadTag(hProfile, cmsSigBlueColorantTag); if (PtrRed == NULL || PtrGreen == NULL || PtrBlue == NULL) return FALSE; _cmsVEC3init(&r -> v[0], PtrRed -> X, PtrGreen -> X, PtrBlue -> X); _cmsVEC3init(&r -> v[1], PtrRed -> Y, PtrGreen -> Y, PtrBlue -> Y); _cmsVEC3init(&r -> v[2], PtrRed -> Z, PtrGreen -> Z, PtrBlue -> Z); return TRUE; } // Gray input pipeline static cmsPipeline* BuildGrayInputMatrixPipeline(cmsHPROFILE hProfile) { cmsToneCurve *GrayTRC; cmsPipeline* Lut; cmsContext ContextID = cmsGetProfileContextID(hProfile); GrayTRC = (cmsToneCurve *) cmsReadTag(hProfile, cmsSigGrayTRCTag); if (GrayTRC == NULL) return NULL; Lut = cmsPipelineAlloc(ContextID, 1, 3); if (Lut == NULL) goto Error; if (cmsGetPCS(hProfile) == cmsSigLabData) { // In this case we implement the profile as an identity matrix plus 3 tone curves cmsUInt16Number Zero[2] = { 0x8080, 0x8080 }; cmsToneCurve* EmptyTab; cmsToneCurve* LabCurves[3]; EmptyTab = cmsBuildTabulatedToneCurve16(ContextID, 2, Zero); if (EmptyTab == NULL) goto Error; LabCurves[0] = GrayTRC; LabCurves[1] = EmptyTab; LabCurves[2] = EmptyTab; if (!cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocMatrix(ContextID, 3, 1, OneToThreeInputMatrix, NULL)) || !cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocToneCurves(ContextID, 3, LabCurves))) { cmsFreeToneCurve(EmptyTab); goto Error; } cmsFreeToneCurve(EmptyTab); } else { if (!cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocToneCurves(ContextID, 1, &GrayTRC)) || !cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocMatrix(ContextID, 3, 1, GrayInputMatrix, NULL))) goto Error; } return Lut; Error: cmsFreeToneCurve(GrayTRC); cmsPipelineFree(Lut); return NULL; } // RGB Matrix shaper static cmsPipeline* BuildRGBInputMatrixShaper(cmsHPROFILE hProfile) { cmsPipeline* Lut; cmsMAT3 Mat; cmsToneCurve *Shapes[3]; cmsContext ContextID = cmsGetProfileContextID(hProfile); int i, j; if (!ReadICCMatrixRGB2XYZ(&Mat, hProfile)) return NULL; // XYZ PCS in encoded in 1.15 format, and the matrix output comes in 0..0xffff range, so // we need to adjust the output by a factor of (0x10000/0xffff) to put data in // a 1.16 range, and then a >> 1 to obtain 1.15. The total factor is (65536.0)/(65535.0*2) for (i=0; i < 3; i++) for (j=0; j < 3; j++) Mat.v[i].n[j] *= InpAdj; Shapes[0] = (cmsToneCurve *) cmsReadTag(hProfile, cmsSigRedTRCTag); Shapes[1] = (cmsToneCurve *) cmsReadTag(hProfile, cmsSigGreenTRCTag); Shapes[2] = (cmsToneCurve *) cmsReadTag(hProfile, cmsSigBlueTRCTag); if (!Shapes[0] || !Shapes[1] || !Shapes[2]) return NULL; Lut = cmsPipelineAlloc(ContextID, 3, 3); if (Lut != NULL) { if (!cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocToneCurves(ContextID, 3, Shapes)) || !cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocMatrix(ContextID, 3, 3, (cmsFloat64Number*) &Mat, NULL))) goto Error; // Note that it is certainly possible a single profile would have a LUT based // tag for output working in lab and a matrix-shaper for the fallback cases. // This is not allowed by the spec, but this code is tolerant to those cases if (cmsGetPCS(hProfile) == cmsSigLabData) { if (!cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageAllocXYZ2Lab(ContextID))) goto Error; } } return Lut; Error: cmsPipelineFree(Lut); return NULL; } // Read the DToAX tag, adjusting the encoding of Lab or XYZ if neded static cmsPipeline* _cmsReadFloatInputTag(cmsHPROFILE hProfile, cmsTagSignature tagFloat) { cmsContext ContextID = cmsGetProfileContextID(hProfile); cmsPipeline* Lut = cmsPipelineDup((cmsPipeline*) cmsReadTag(hProfile, tagFloat)); cmsColorSpaceSignature spc = cmsGetColorSpace(hProfile); cmsColorSpaceSignature PCS = cmsGetPCS(hProfile); if (Lut == NULL) return NULL; // input and output of transform are in lcms 0..1 encoding. If XYZ or Lab spaces are used, // these need to be normalized into the appropriate ranges (Lab = 100,0,0, XYZ=1.0,1.0,1.0) if ( spc == cmsSigLabData) { if (!cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageNormalizeToLabFloat(ContextID))) goto Error; } else if (spc == cmsSigXYZData) { if (!cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageNormalizeToXyzFloat(ContextID))) goto Error; } if ( PCS == cmsSigLabData) { if (!cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageNormalizeFromLabFloat(ContextID))) goto Error; } else if( PCS == cmsSigXYZData) { if (!cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageNormalizeFromXyzFloat(ContextID))) goto Error; } return Lut; Error: cmsPipelineFree(Lut); return NULL; } // Read and create a BRAND NEW MPE LUT from a given profile. All stuff dependent of version, etc // is adjusted here in order to create a LUT that takes care of all those details. // We add intent = -1 as a way to read matrix shaper always, no matter of other LUT cmsPipeline* _cmsReadInputLUT(cmsHPROFILE hProfile, int Intent) { cmsTagTypeSignature OriginalType; cmsTagSignature tag16; cmsTagSignature tagFloat; cmsContext ContextID = cmsGetProfileContextID(hProfile); // On named color, take the appropriate tag if (cmsGetDeviceClass(hProfile) == cmsSigNamedColorClass) { cmsPipeline* Lut; cmsNAMEDCOLORLIST* nc = (cmsNAMEDCOLORLIST*) cmsReadTag(hProfile, cmsSigNamedColor2Tag); if (nc == NULL) return NULL; Lut = cmsPipelineAlloc(ContextID, 0, 0); if (Lut == NULL) { cmsFreeNamedColorList(nc); return NULL; } if (!cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageAllocNamedColor(nc, TRUE)) || !cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageAllocLabV2ToV4(ContextID))) { cmsPipelineFree(Lut); return NULL; } return Lut; } // This is an attempt to reuse this function to retrieve the matrix-shaper as pipeline no // matter other LUT are present and have precedence. Intent = -1 means just this. if (Intent >= INTENT_PERCEPTUAL && Intent <= INTENT_ABSOLUTE_COLORIMETRIC) { tag16 = Device2PCS16[Intent]; tagFloat = Device2PCSFloat[Intent]; if (cmsIsTag(hProfile, tagFloat)) { // Float tag takes precedence // Floating point LUT are always V4, but the encoding range is no // longer 0..1.0, so we need to add an stage depending on the color space return _cmsReadFloatInputTag(hProfile, tagFloat); } // Revert to perceptual if no tag is found if (!cmsIsTag(hProfile, tag16)) { tag16 = Device2PCS16[0]; } if (cmsIsTag(hProfile, tag16)) { // Is there any LUT-Based table? // Check profile version and LUT type. Do the necessary adjustments if needed // First read the tag cmsPipeline* Lut = (cmsPipeline*) cmsReadTag(hProfile, tag16); if (Lut == NULL) return NULL; // After reading it, we have now info about the original type OriginalType = _cmsGetTagTrueType(hProfile, tag16); // The profile owns the Lut, so we need to copy it Lut = cmsPipelineDup(Lut); // We need to adjust data only for Lab16 on output if (OriginalType != cmsSigLut16Type || cmsGetPCS(hProfile) != cmsSigLabData) return Lut; // If the input is Lab, add also a conversion at the begin if (cmsGetColorSpace(hProfile) == cmsSigLabData && !cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageAllocLabV4ToV2(ContextID))) goto Error; // Add a matrix for conversion V2 to V4 Lab PCS if (!cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageAllocLabV2ToV4(ContextID))) goto Error; return Lut; Error: cmsPipelineFree(Lut); return NULL; } } // Lut was not found, try to create a matrix-shaper // Check if this is a grayscale profile. if (cmsGetColorSpace(hProfile) == cmsSigGrayData) { // if so, build appropriate conversion tables. // The tables are the PCS iluminant, scaled across GrayTRC return BuildGrayInputMatrixPipeline(hProfile); } // Not gray, create a normal matrix-shaper return BuildRGBInputMatrixShaper(hProfile); } // --------------------------------------------------------------------------------------------------------------- // Gray output pipeline. // XYZ -> Gray or Lab -> Gray. Since we only know the GrayTRC, we need to do some assumptions. Gray component will be // given by Y on XYZ PCS and by L* on Lab PCS, Both across inverse TRC curve. // The complete pipeline on XYZ is Matrix[3:1] -> Tone curve and in Lab Matrix[3:1] -> Tone Curve as well. static cmsPipeline* BuildGrayOutputPipeline(cmsHPROFILE hProfile) { cmsToneCurve *GrayTRC, *RevGrayTRC; cmsPipeline* Lut; cmsContext ContextID = cmsGetProfileContextID(hProfile); GrayTRC = (cmsToneCurve *) cmsReadTag(hProfile, cmsSigGrayTRCTag); if (GrayTRC == NULL) return NULL; RevGrayTRC = cmsReverseToneCurve(GrayTRC); if (RevGrayTRC == NULL) return NULL; Lut = cmsPipelineAlloc(ContextID, 3, 1); if (Lut == NULL) { cmsFreeToneCurve(RevGrayTRC); return NULL; } if (cmsGetPCS(hProfile) == cmsSigLabData) { if (!cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocMatrix(ContextID, 1, 3, PickLstarMatrix, NULL))) goto Error; } else { if (!cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocMatrix(ContextID, 1, 3, PickYMatrix, NULL))) goto Error; } if (!cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocToneCurves(ContextID, 1, &RevGrayTRC))) goto Error; cmsFreeToneCurve(RevGrayTRC); return Lut; Error: cmsFreeToneCurve(RevGrayTRC); cmsPipelineFree(Lut); return NULL; } static cmsPipeline* BuildRGBOutputMatrixShaper(cmsHPROFILE hProfile) { cmsPipeline* Lut; cmsToneCurve *Shapes[3], *InvShapes[3]; cmsMAT3 Mat, Inv; int i, j; cmsContext ContextID = cmsGetProfileContextID(hProfile); if (!ReadICCMatrixRGB2XYZ(&Mat, hProfile)) return NULL; if (!_cmsMAT3inverse(&Mat, &Inv)) return NULL; // XYZ PCS in encoded in 1.15 format, and the matrix input should come in 0..0xffff range, so // we need to adjust the input by a << 1 to obtain a 1.16 fixed and then by a factor of // (0xffff/0x10000) to put data in 0..0xffff range. Total factor is (2.0*65535.0)/65536.0; for (i=0; i < 3; i++) for (j=0; j < 3; j++) Inv.v[i].n[j] *= OutpAdj; Shapes[0] = (cmsToneCurve *) cmsReadTag(hProfile, cmsSigRedTRCTag); Shapes[1] = (cmsToneCurve *) cmsReadTag(hProfile, cmsSigGreenTRCTag); Shapes[2] = (cmsToneCurve *) cmsReadTag(hProfile, cmsSigBlueTRCTag); if (!Shapes[0] || !Shapes[1] || !Shapes[2]) return NULL; InvShapes[0] = cmsReverseToneCurve(Shapes[0]); InvShapes[1] = cmsReverseToneCurve(Shapes[1]); InvShapes[2] = cmsReverseToneCurve(Shapes[2]); if (!InvShapes[0] || !InvShapes[1] || !InvShapes[2]) { return NULL; } Lut = cmsPipelineAlloc(ContextID, 3, 3); if (Lut != NULL) { // Note that it is certainly possible a single profile would have a LUT based // tag for output working in lab and a matrix-shaper for the fallback cases. // This is not allowed by the spec, but this code is tolerant to those cases if (cmsGetPCS(hProfile) == cmsSigLabData) { if (!cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageAllocLab2XYZ(ContextID))) goto Error; } if (!cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocMatrix(ContextID, 3, 3, (cmsFloat64Number*) &Inv, NULL)) || !cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocToneCurves(ContextID, 3, InvShapes))) goto Error; } cmsFreeToneCurveTriple(InvShapes); return Lut; Error: cmsFreeToneCurveTriple(InvShapes); cmsPipelineFree(Lut); return NULL; } // Change CLUT interpolation to trilinear static void ChangeInterpolationToTrilinear(cmsPipeline* Lut) { cmsStage* Stage; for (Stage = cmsPipelineGetPtrToFirstStage(Lut); Stage != NULL; Stage = cmsStageNext(Stage)) { if (cmsStageType(Stage) == cmsSigCLutElemType) { _cmsStageCLutData* CLUT = (_cmsStageCLutData*) Stage ->Data; CLUT ->Params->dwFlags |= CMS_LERP_FLAGS_TRILINEAR; _cmsSetInterpolationRoutine(Lut->ContextID, CLUT ->Params); } } } // Read the DToAX tag, adjusting the encoding of Lab or XYZ if neded static cmsPipeline* _cmsReadFloatOutputTag(cmsHPROFILE hProfile, cmsTagSignature tagFloat) { cmsContext ContextID = cmsGetProfileContextID(hProfile); cmsPipeline* Lut = cmsPipelineDup((cmsPipeline*) cmsReadTag(hProfile, tagFloat)); cmsColorSpaceSignature PCS = cmsGetPCS(hProfile); cmsColorSpaceSignature dataSpace = cmsGetColorSpace(hProfile); if (Lut == NULL) return NULL; // If PCS is Lab or XYZ, the floating point tag is accepting data in the space encoding, // and since the formatter has already accommodated to 0..1.0, we should undo this change if ( PCS == cmsSigLabData) { if (!cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageNormalizeToLabFloat(ContextID))) goto Error; } else if (PCS == cmsSigXYZData) { if (!cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageNormalizeToXyzFloat(ContextID))) goto Error; } // the output can be Lab or XYZ, in which case normalisation is needed on the end of the pipeline if ( dataSpace == cmsSigLabData) { if (!cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageNormalizeFromLabFloat(ContextID))) goto Error; } else if (dataSpace == cmsSigXYZData) { if (!cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageNormalizeFromXyzFloat(ContextID))) goto Error; } return Lut; Error: cmsPipelineFree(Lut); return NULL; } // Create an output MPE LUT from agiven profile. Version mismatches are handled here cmsPipeline* _cmsReadOutputLUT(cmsHPROFILE hProfile, int Intent) { cmsTagTypeSignature OriginalType; cmsTagSignature tag16; cmsTagSignature tagFloat; cmsContext ContextID = cmsGetProfileContextID(hProfile); if (Intent >= INTENT_PERCEPTUAL && Intent <= INTENT_ABSOLUTE_COLORIMETRIC) { tag16 = PCS2Device16[Intent]; tagFloat = PCS2DeviceFloat[Intent]; if (cmsIsTag(hProfile, tagFloat)) { // Float tag takes precedence // Floating point LUT are always V4 return _cmsReadFloatOutputTag(hProfile, tagFloat); } // Revert to perceptual if no tag is found if (!cmsIsTag(hProfile, tag16)) { tag16 = PCS2Device16[0]; } if (cmsIsTag(hProfile, tag16)) { // Is there any LUT-Based table? // Check profile version and LUT type. Do the necessary adjustments if needed // First read the tag cmsPipeline* Lut = (cmsPipeline*) cmsReadTag(hProfile, tag16); if (Lut == NULL) return NULL; // After reading it, we have info about the original type OriginalType = _cmsGetTagTrueType(hProfile, tag16); // The profile owns the Lut, so we need to copy it Lut = cmsPipelineDup(Lut); if (Lut == NULL) return NULL; // Now it is time for a controversial stuff. I found that for 3D LUTS using // Lab used as indexer space, trilinear interpolation should be used if (cmsGetPCS(hProfile) == cmsSigLabData) ChangeInterpolationToTrilinear(Lut); // We need to adjust data only for Lab and Lut16 type if (OriginalType != cmsSigLut16Type || cmsGetPCS(hProfile) != cmsSigLabData) return Lut; // Add a matrix for conversion V4 to V2 Lab PCS if (!cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageAllocLabV4ToV2(ContextID))) goto Error; // If the output is Lab, add also a conversion at the end if (cmsGetColorSpace(hProfile) == cmsSigLabData) if (!cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageAllocLabV2ToV4(ContextID))) goto Error; return Lut; Error: cmsPipelineFree(Lut); return NULL; } } // Lut not found, try to create a matrix-shaper // Check if this is a grayscale profile. if (cmsGetColorSpace(hProfile) == cmsSigGrayData) { // if so, build appropriate conversion tables. // The tables are the PCS iluminant, scaled across GrayTRC return BuildGrayOutputPipeline(hProfile); } // Not gray, create a normal matrix-shaper, which only operates in XYZ space return BuildRGBOutputMatrixShaper(hProfile); } // --------------------------------------------------------------------------------------------------------------- // Read the AToD0 tag, adjusting the encoding of Lab or XYZ if neded static cmsPipeline* _cmsReadFloatDevicelinkTag(cmsHPROFILE hProfile, cmsTagSignature tagFloat) { cmsContext ContextID = cmsGetProfileContextID(hProfile); cmsPipeline* Lut = cmsPipelineDup((cmsPipeline*) cmsReadTag(hProfile, tagFloat)); cmsColorSpaceSignature PCS = cmsGetPCS(hProfile); cmsColorSpaceSignature spc = cmsGetColorSpace(hProfile); if (Lut == NULL) return NULL; if (spc == cmsSigLabData) { if (!cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageNormalizeToLabFloat(ContextID))) goto Error; } else if (spc == cmsSigXYZData) { if (!cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageNormalizeToXyzFloat(ContextID))) goto Error; } if (PCS == cmsSigLabData) { if (!cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageNormalizeFromLabFloat(ContextID))) goto Error; } else if (PCS == cmsSigXYZData) { if (!cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageNormalizeFromXyzFloat(ContextID))) goto Error; } return Lut; Error: cmsPipelineFree(Lut); return NULL; } // This one includes abstract profiles as well. Matrix-shaper cannot be obtained on that device class. The // tag name here may default to AToB0 cmsPipeline* _cmsReadDevicelinkLUT(cmsHPROFILE hProfile, int Intent) { cmsPipeline* Lut; cmsTagTypeSignature OriginalType; cmsTagSignature tag16; cmsTagSignature tagFloat; cmsContext ContextID = cmsGetProfileContextID(hProfile); if (Intent < INTENT_PERCEPTUAL || Intent > INTENT_ABSOLUTE_COLORIMETRIC) return NULL; tag16 = Device2PCS16[Intent]; tagFloat = Device2PCSFloat[Intent]; // On named color, take the appropriate tag if (cmsGetDeviceClass(hProfile) == cmsSigNamedColorClass) { cmsNAMEDCOLORLIST* nc = (cmsNAMEDCOLORLIST*)cmsReadTag(hProfile, cmsSigNamedColor2Tag); if (nc == NULL) return NULL; Lut = cmsPipelineAlloc(ContextID, 0, 0); if (Lut == NULL) goto Error; if (!cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageAllocNamedColor(nc, FALSE))) goto Error; if (cmsGetColorSpace(hProfile) == cmsSigLabData) if (!cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageAllocLabV2ToV4(ContextID))) goto Error; return Lut; Error: cmsPipelineFree(Lut); cmsFreeNamedColorList(nc); return NULL; } if (cmsIsTag(hProfile, tagFloat)) { // Float tag takes precedence // Floating point LUT are always V return _cmsReadFloatDevicelinkTag(hProfile, tagFloat); } tagFloat = Device2PCSFloat[0]; if (cmsIsTag(hProfile, tagFloat)) { return cmsPipelineDup((cmsPipeline*)cmsReadTag(hProfile, tagFloat)); } if (!cmsIsTag(hProfile, tag16)) { // Is there any LUT-Based table? tag16 = Device2PCS16[0]; if (!cmsIsTag(hProfile, tag16)) return NULL; } // Check profile version and LUT type. Do the necessary adjustments if needed // Read the tag Lut = (cmsPipeline*)cmsReadTag(hProfile, tag16); if (Lut == NULL) return NULL; // The profile owns the Lut, so we need to copy it Lut = cmsPipelineDup(Lut); if (Lut == NULL) return NULL; // Now it is time for a controversial stuff. I found that for 3D LUTS using // Lab used as indexer space, trilinear interpolation should be used if (cmsGetPCS(hProfile) == cmsSigLabData) ChangeInterpolationToTrilinear(Lut); // After reading it, we have info about the original type OriginalType = _cmsGetTagTrueType(hProfile, tag16); // We need to adjust data for Lab16 on output if (OriginalType != cmsSigLut16Type) return Lut; // Here it is possible to get Lab on both sides if (cmsGetColorSpace(hProfile) == cmsSigLabData) { if (!cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageAllocLabV4ToV2(ContextID))) goto Error2; } if (cmsGetPCS(hProfile) == cmsSigLabData) { if (!cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageAllocLabV2ToV4(ContextID))) goto Error2; } return Lut; Error2: cmsPipelineFree(Lut); return NULL; } // --------------------------------------------------------------------------------------------------------------- // Returns TRUE if the profile is implemented as matrix-shaper cmsBool CMSEXPORT cmsIsMatrixShaper(cmsHPROFILE hProfile) { switch (cmsGetColorSpace(hProfile)) { case cmsSigGrayData: return cmsIsTag(hProfile, cmsSigGrayTRCTag); case cmsSigRgbData: return (cmsIsTag(hProfile, cmsSigRedColorantTag) && cmsIsTag(hProfile, cmsSigGreenColorantTag) && cmsIsTag(hProfile, cmsSigBlueColorantTag) && cmsIsTag(hProfile, cmsSigRedTRCTag) && cmsIsTag(hProfile, cmsSigGreenTRCTag) && cmsIsTag(hProfile, cmsSigBlueTRCTag)); default: return FALSE; } } // Returns TRUE if the intent is implemented as CLUT cmsBool CMSEXPORT cmsIsCLUT(cmsHPROFILE hProfile, cmsUInt32Number Intent, cmsUInt32Number UsedDirection) { const cmsTagSignature* TagTable; // For devicelinks, the supported intent is that one stated in the header if (cmsGetDeviceClass(hProfile) == cmsSigLinkClass) { return (cmsGetHeaderRenderingIntent(hProfile) == Intent); } switch (UsedDirection) { case LCMS_USED_AS_INPUT: TagTable = Device2PCS16; break; case LCMS_USED_AS_OUTPUT:TagTable = PCS2Device16; break; // For proofing, we need rel. colorimetric in output. Let's do some recursion case LCMS_USED_AS_PROOF: return cmsIsIntentSupported(hProfile, Intent, LCMS_USED_AS_INPUT) && cmsIsIntentSupported(hProfile, INTENT_RELATIVE_COLORIMETRIC, LCMS_USED_AS_OUTPUT); default: cmsSignalError(cmsGetProfileContextID(hProfile), cmsERROR_RANGE, "Unexpected direction (%d)", UsedDirection); return FALSE; } return cmsIsTag(hProfile, TagTable[Intent]); } // Return info about supported intents cmsBool CMSEXPORT cmsIsIntentSupported(cmsHPROFILE hProfile, cmsUInt32Number Intent, cmsUInt32Number UsedDirection) { if (cmsIsCLUT(hProfile, Intent, UsedDirection)) return TRUE; // Is there any matrix-shaper? If so, the intent is supported. This is a bit odd, since V2 matrix shaper // does not fully support relative colorimetric because they cannot deal with non-zero black points, but // many profiles claims that, and this is certainly not true for V4 profiles. Lets answer "yes" no matter // the accuracy would be less than optimal in rel.col and v2 case. return cmsIsMatrixShaper(hProfile); } // --------------------------------------------------------------------------------------------------------------- // Read both, profile sequence description and profile sequence id if present. Then combine both to // create qa unique structure holding both. Shame on ICC to store things in such complicated way. cmsSEQ* _cmsReadProfileSequence(cmsHPROFILE hProfile) { cmsSEQ* ProfileSeq; cmsSEQ* ProfileId; cmsSEQ* NewSeq; cmsUInt32Number i; // Take profile sequence description first ProfileSeq = (cmsSEQ*) cmsReadTag(hProfile, cmsSigProfileSequenceDescTag); // Take profile sequence ID ProfileId = (cmsSEQ*) cmsReadTag(hProfile, cmsSigProfileSequenceIdTag); if (ProfileSeq == NULL && ProfileId == NULL) return NULL; if (ProfileSeq == NULL) return cmsDupProfileSequenceDescription(ProfileId); if (ProfileId == NULL) return cmsDupProfileSequenceDescription(ProfileSeq); // We have to mix both together. For that they must agree if (ProfileSeq ->n != ProfileId ->n) return cmsDupProfileSequenceDescription(ProfileSeq); NewSeq = cmsDupProfileSequenceDescription(ProfileSeq); // Ok, proceed to the mixing if (NewSeq != NULL) { for (i=0; i < ProfileSeq ->n; i++) { memmove(&NewSeq ->seq[i].ProfileID, &ProfileId ->seq[i].ProfileID, sizeof(cmsProfileID)); NewSeq ->seq[i].Description = cmsMLUdup(ProfileId ->seq[i].Description); } } return NewSeq; } // Dump the contents of profile sequence in both tags (if v4 available) cmsBool _cmsWriteProfileSequence(cmsHPROFILE hProfile, const cmsSEQ* seq) { if (!cmsWriteTag(hProfile, cmsSigProfileSequenceDescTag, seq)) return FALSE; if (cmsGetEncodedICCversion(hProfile) >= 0x4000000) { if (!cmsWriteTag(hProfile, cmsSigProfileSequenceIdTag, seq)) return FALSE; } return TRUE; } // Auxiliary, read and duplicate a MLU if found. static cmsMLU* GetMLUFromProfile(cmsHPROFILE h, cmsTagSignature sig) { cmsMLU* mlu = (cmsMLU*) cmsReadTag(h, sig); if (mlu == NULL) return NULL; return cmsMLUdup(mlu); } // Create a sequence description out of an array of profiles cmsSEQ* _cmsCompileProfileSequence(cmsContext ContextID, cmsUInt32Number nProfiles, cmsHPROFILE hProfiles[]) { cmsUInt32Number i; cmsSEQ* seq = cmsAllocProfileSequenceDescription(ContextID, nProfiles); if (seq == NULL) return NULL; for (i=0; i < nProfiles; i++) { cmsPSEQDESC* ps = &seq ->seq[i]; cmsHPROFILE h = hProfiles[i]; cmsTechnologySignature* techpt; cmsGetHeaderAttributes(h, &ps ->attributes); cmsGetHeaderProfileID(h, ps ->ProfileID.ID8); ps ->deviceMfg = cmsGetHeaderManufacturer(h); ps ->deviceModel = cmsGetHeaderModel(h); techpt = (cmsTechnologySignature*) cmsReadTag(h, cmsSigTechnologyTag); if (techpt == NULL) ps ->technology = (cmsTechnologySignature) 0; else ps ->technology = *techpt; ps ->Manufacturer = GetMLUFromProfile(h, cmsSigDeviceMfgDescTag); ps ->Model = GetMLUFromProfile(h, cmsSigDeviceModelDescTag); ps ->Description = GetMLUFromProfile(h, cmsSigProfileDescriptionTag); } return seq; } // ------------------------------------------------------------------------------------------------------------------- static const cmsMLU* GetInfo(cmsHPROFILE hProfile, cmsInfoType Info) { cmsTagSignature sig; switch (Info) { case cmsInfoDescription: sig = cmsSigProfileDescriptionTag; break; case cmsInfoManufacturer: sig = cmsSigDeviceMfgDescTag; break; case cmsInfoModel: sig = cmsSigDeviceModelDescTag; break; case cmsInfoCopyright: sig = cmsSigCopyrightTag; break; default: return NULL; } return (cmsMLU*) cmsReadTag(hProfile, sig); } cmsUInt32Number CMSEXPORT cmsGetProfileInfo(cmsHPROFILE hProfile, cmsInfoType Info, const char LanguageCode[3], const char CountryCode[3], wchar_t* Buffer, cmsUInt32Number BufferSize) { const cmsMLU* mlu = GetInfo(hProfile, Info); if (mlu == NULL) return 0; return cmsMLUgetWide(mlu, LanguageCode, CountryCode, Buffer, BufferSize); } cmsUInt32Number CMSEXPORT cmsGetProfileInfoASCII(cmsHPROFILE hProfile, cmsInfoType Info, const char LanguageCode[3], const char CountryCode[3], char* Buffer, cmsUInt32Number BufferSize) { const cmsMLU* mlu = GetInfo(hProfile, Info); if (mlu == NULL) return 0; return cmsMLUgetASCII(mlu, LanguageCode, CountryCode, Buffer, BufferSize); }