bcolor.hxx

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#pragma once
 
#include <sal/config.h>
 
#include <algorithm>
#include <ostream>
 
#include <basegfx/tuple/b3dtuple.hxx>
#include <basegfx/basegfxdllapi.h>
 
namespace basegfx
{
    class SAL_WARN_UNUSED BASEGFX_DLLPUBLIC BColor : public B3DTuple
    {
    public:
        BColor()
        {}
 
        BColor(double fRed, double fGreen, double fBlue)
        :   B3DTuple(fRed, fGreen, fBlue)
        {}
 
        explicit BColor(double fLuminosity)
        :   B3DTuple(fLuminosity, fLuminosity, fLuminosity)
        {}
 
        BColor(const ::basegfx::B3DTuple& rTuple)
        :   B3DTuple(rTuple)
        {}
 
        // data access read
        double getRed() const { return mfX; }
        double getGreen() const { return mfY; }
        double getBlue() const { return mfZ; }
 
        // data access write
        void setRed(double fNew) { mfX = fNew; }
        void setGreen(double fNew) { mfY = fNew; }
        void setBlue(double fNew) { mfZ = fNew; }
 
        BColor& operator*=( const BColor& rPnt )
        {
            mfX *= rPnt.mfX;
            mfY *= rPnt.mfY;
            mfZ *= rPnt.mfZ;
            return *this;
        }
 
        BColor& operator*=(double t)
        {
            mfX *= t;
            mfY *= t;
            mfZ *= t;
            return *this;
        }
 
        BColor& operator=( const ::basegfx::B3DTuple& rVec )
        {
            mfX = rVec.getX();
            mfY = rVec.getY();
            mfZ = rVec.getZ();
            return *this;
        }
 
        // luminance
        double luminance() const
        {
            const double fRedWeight(77.0 / 256.0);      // 0.30
            const double fGreenWeight(151.0 / 256.0);   // 0.59
            const double fBlueWeight(28.0 / 256.0);     // 0.11
 
            return (mfX * fRedWeight + mfY * fGreenWeight + mfZ * fBlueWeight);
        }
 
        // distances in color space
        double getDistanceRed(const BColor& rColor) const { return (getRed() > rColor.getRed() ? getRed() - rColor.getRed() : rColor.getRed() - getRed()); }
        double getDistanceGreen(const BColor& rColor) const { return (getGreen() > rColor.getGreen() ? getGreen() - rColor.getGreen() : rColor.getGreen() - getGreen()); }
        double getDistanceBlue(const BColor& rColor) const { return (getBlue() > rColor.getBlue() ? getBlue() - rColor.getBlue() : rColor.getBlue() - getBlue()); }
 
        double getDistance(const BColor& rColor) const
        {
            const double fDistR(getDistanceRed(rColor));
            const double fDistG(getDistanceGreen(rColor));
            const double fDistB(getDistanceBlue(rColor));
 
            return std::hypot(fDistR, fDistG, fDistB);
        }
 
        double getMaximumDistance(const BColor& rColor) const
        {
            const double fDistR(getDistanceRed(rColor));
            const double fDistG(getDistanceGreen(rColor));
            const double fDistB(getDistanceBlue(rColor));
 
            double fRetval(std::max(fDistR, fDistG));
            return std::max(fRetval, fDistB);
        }
 
        // clamp color to [0.0..1.0] values in all three intensity components
        BColor& clamp()
        {
            mfX = std::clamp(mfX, 0.0, 1.0);
            mfY = std::clamp(mfY, 0.0, 1.0);
            mfZ = std::clamp(mfZ, 0.0, 1.0);
            return *this;
        }
 
        void invert()
        {
            mfX = 1.0 - mfX;
            mfY = 1.0 - mfY;
            mfZ = 1.0 - mfZ;
        }
 
        static const BColor& getEmptyBColor()
        {
            return static_cast<const BColor&>( ::basegfx::B3DTuple::getEmptyTuple() );
        }
 
    };
 
    template<typename charT, typename traits>
    std::basic_ostream<charT, traits> & operator <<(
        std::basic_ostream<charT, traits> & stream, BColor const & color)
    {
        return stream
            << '[' << color.getRed() << ", " << color.getGreen() << ", "
            << color.getBlue() << ']';
    }
} // end of namespace basegfx
 
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