LCMS: rename folder

Change-Id: I5f240cb0779648dc5427fecb5561086e7c0fb16a
Reviewed-on: https://pdfium-review.googlesource.com/10650
Reviewed-by: dsinclair <dsinclair@chromium.org>
Commit-Queue: Nicolás Peña <npm@chromium.org>

1 files changed, 1020 insertions, 0 deletions

diff --git a/third_party/lcms/src/cmsio1.c b/third_party/lcms/src/cmsio1.c
new file mode 100644
index 0000000000..778aa2b4fc
--- /dev/null
+++ b/third_party/lcms/src/cmsio1.c
@@ -0,0 +1,1020 @@
+//---------------------------------------------------------------------------------
+//
+//  Little Color Management System
+//  Copyright (c) 1998-2012 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;
+}
+
+
+// Auxiliar, 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:
+	// memory pointed by GrayTRC is not a new malloc memory, so don't free it here, 
+	// memory pointed by GrayTRC will be freed when hProfile is closed.
+	// test file :0047776_Pocket Medicine_ The Massachusetts General Hospital Handbook of Internal Medicine-2.pdf
+	// Xiaochuan Liu, 20140421
+    //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    = Device2PCS16[Intent];
+    cmsTagSignature tagFloat = Device2PCSFloat[Intent];
+    cmsContext ContextID = cmsGetProfileContextID(hProfile);
+
+    // On named color, take the appropiate 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 funtion to retrieve the matrix-shaper as pipeline no
+    // matter other LUT are present and have precedence. Intent = -1 means just this.
+    if (Intent != -1) {
+
+        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 appropiate 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 accomodated 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    = PCS2Device16[Intent];
+    cmsTagSignature tagFloat = PCS2DeviceFloat[Intent];
+    cmsContext ContextID     = cmsGetProfileContextID(hProfile);
+
+
+    if (Intent != -1) {
+
+        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 appropiate 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    = Device2PCS16[Intent];
+    cmsTagSignature tagFloat = Device2PCSFloat[Intent];
+    cmsContext ContextID = cmsGetProfileContextID(hProfile);
+
+
+    // On named color, take the appropiate 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 (cmsGetProfileVersion(hProfile) >= 4.0) {
+
+            if (!cmsWriteTag(hProfile, cmsSigProfileSequenceIdTag, seq)) return FALSE;
+    }
+
+    return TRUE;
+}
+
+
+// Auxiliar, 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);
+}