QByteArray LcmsColorProfileContainer::createFromChromacities(const KoRGBChromaticities& _chromacities, qreal gamma, QString _profileName)
{
cmsCIExyYTRIPLE primaries;
cmsCIExyY whitePoint;
lcmsToPigmentViceVersaStructureCopy(primaries.Red, _chromacities.primaries.Red);
lcmsToPigmentViceVersaStructureCopy(primaries.Green, _chromacities.primaries.Green);
lcmsToPigmentViceVersaStructureCopy(primaries.Blue, _chromacities.primaries.Blue);
lcmsToPigmentViceVersaStructureCopy(whitePoint, _chromacities.whitePoint);
cmsToneCurve* gammaTable = cmsBuildGamma(0, gamma);
const int numTransferFunctions = 3;
cmsToneCurve* transferFunctions[numTransferFunctions];
for (int i = 0; i < numTransferFunctions; ++i) {
transferFunctions[i] = gammaTable;
}
cmsHPROFILE profile = cmsCreateRGBProfile(&whitePoint, &primaries,
transferFunctions);
QString name = _profileName;
if (name.isEmpty()) {
name = QString("lcms virtual RGB profile - R(%1, %2) G(%3, %4) B(%5, %6) W(%7, %8) gamma %9")
.arg(primaries.Red.x)
.arg(primaries.Red.y)
.arg(primaries.Green.x)
.arg(primaries.Green.y)
.arg(primaries.Blue.x)
.arg(primaries.Blue.y)
.arg(whitePoint.x)
.arg(whitePoint.y)
.arg(gamma);
}
// icSigProfileDescriptionTag is the compulsory tag and is the profile name
// displayed by other applications.
cmsWriteTag(profile, cmsSigProfileDescriptionTag, name.toLatin1().data());
cmsWriteTag(profile, cmsSigDeviceModelDescTag, name.toLatin1().data());
// Clear the default manufacturer's tag that is set to "(lcms internal)"
QByteArray ba("");
cmsWriteTag(profile, cmsSigDeviceMfgDescTag, ba.data());
cmsFreeToneCurve(gammaTable);
QByteArray profileArray = lcmsProfileToByteArray(profile);
cmsCloseProfile(profile);
return profileArray;
}
static KoCIExyY RGB2xyY(cmsHPROFILE RGBProfile, qreal red, qreal green, qreal blue)
{
cmsHPROFILE XYZProfile = cmsCreateXYZProfile();
const cmsUInt32Number inputFormat = TYPE_RGB_DBL;
const cmsUInt32Number outputFormat = TYPE_XYZ_DBL;
const cmsUInt32Number transformFlags = cmsFLAGS_LOWRESPRECALC;
cmsHTRANSFORM transform = cmsCreateTransform(RGBProfile, inputFormat, XYZProfile, outputFormat,
INTENT_ABSOLUTE_COLORIMETRIC, transformFlags);
struct XYZPixel {
qreal X;
qreal Y;
qreal Z;
};
struct RGBPixel {
qreal red;
qreal green;
qreal blue;
};
XYZPixel xyzPixel;
RGBPixel rgbPixel;
rgbPixel.red = red;
rgbPixel.green = green;
rgbPixel.blue = blue;
const unsigned int numPixelsToTransform = 1;
cmsDoTransform(transform, &rgbPixel, &xyzPixel, numPixelsToTransform);
cmsCIEXYZ xyzPixelXYZ;
xyzPixelXYZ.X = xyzPixel.X;
xyzPixelXYZ.Y = xyzPixel.Y;
xyzPixelXYZ.Z = xyzPixel.Z;
cmsCIExyY xyzPixelxyY;
cmsXYZ2xyY(&xyzPixelxyY, &xyzPixelXYZ);
cmsDeleteTransform(transform);
cmsCloseProfile(XYZProfile);
KoCIExyY res;
lcmsToPigmentViceVersaStructureCopy(res, xyzPixelxyY);
return res;
}
