SaI2xScaler.hh

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#ifndef SAI2XSCALER_HH
#define SAI2XSCALER_HH
 
#include "Scaler2.hh"
#include "PixelOperations.hh"
#include <span>
 
namespace openmsx {
 
template<std::unsigned_integral 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(
                std::span<const Pixel> srcLine0, std::span<const Pixel> srcLine1,
                std::span<const Pixel> srcLine2, std::span<const Pixel> srcLine3,
                std::span<Pixel> dstUpper, std::span<Pixel> dstLower);
        void scaleLine1on1(
                std::span<const Pixel> srcLine0, std::span<const Pixel> srcLine1,
                std::span<const Pixel> srcLine2, std::span<const Pixel> srcLine3,
                std::span<Pixel> dstUpper, std::span<Pixel> dstLower);
 
        [[nodiscard]] inline Pixel blend(Pixel p1, Pixel p2) const;
 
private:
        PixelOperations<Pixel> pixelOps;
};
 
} // namespace openmsx
 
#endif