Scale2xScaler.hh

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#ifndef SCALE2XSCALER_HH
#define SCALE2XSCALER_HH
 
#include "Scaler2.hh"
#include <cstddef>
#include <span>
 
namespace openmsx {
 
template<std::unsigned_integral Pixel>
class Scale2xScaler final : public Scaler2<Pixel>
{
public:
        explicit Scale2xScaler(const PixelOperations<Pixel>& pixelOps);
 
        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 scaleLine_1on2(std::span<Pixel> dst0, std::span<Pixel> dst1,
                std::span<const Pixel> src0, std::span<const Pixel> src1, std::span<const Pixel> src2);
        void scaleLineHalf_1on2(std::span<Pixel> dst,
                std::span<const Pixel> src0, std::span<const Pixel> src1, std::span<const Pixel> src2);
 
        void scaleLine_1on1(std::span<Pixel> dst0, std::span<Pixel> dst1,
                std::span<const Pixel> src0, std::span<const Pixel> src1, std::span<const Pixel> src2);
        void scaleLineHalf_1on1(std::span<Pixel> dst,
                std::span<const Pixel> src0, std::span<const Pixel> src1, std::span<const Pixel> src2);
};
 
} // namespace openmsx
 
#endif