SaI2xScaler.hh

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#ifndef SAI2XSCALER_HH
#define SAI2XSCALER_HH

#include "Scaler2.hh"
#include "PixelOperations.hh"

namespace openmsx {

template <class Pixel>
class SaI2xScaler final : public Scaler2<Pixel>
{
public:
        explicit SaI2xScaler(const PixelOperations<Pixel>& pixelOps);
        void scaleBlank1to2(
                FrameSource& src, unsigned srcStartY, unsigned srcEndY,
                ScalerOutput<Pixel>& dst, unsigned dstStartY, unsigned dstEndY) override;
        void scale1x1to2x2(FrameSource& src,
                unsigned srcStartY, unsigned srcEndY, unsigned srcWidth,
                ScalerOutput<Pixel>& dst, unsigned dstStartY, unsigned dstEndY) override;
        void scale1x1to1x2(FrameSource& src,
                unsigned srcStartY, unsigned srcEndY, unsigned srcWidth,
                ScalerOutput<Pixel>& dst, unsigned dstStartY, unsigned dstEndY) override;

private:
        void scaleLine1on2(
                const Pixel* srcLine0, const Pixel* srcLine1,
                const Pixel* srcLine2, const Pixel* srcLine3,
                Pixel* dstUpper, Pixel* dstLower, unsigned srcWidth);
        void scaleLine1on1(
                const Pixel* srcLine0, const Pixel* srcLine1,
                const Pixel* srcLine2, const Pixel* srcLine3,
                Pixel* dstUpper, Pixel* dstLower, unsigned srcWidth);

        inline Pixel blend(Pixel p1, Pixel p2);

        PixelOperations<Pixel> pixelOps;
};

} // namespace openmsx

#endif