Scanline.hh

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#ifndef SCANLINE_HH
#define SCANLINE_HH
 
#include "PixelOperations.hh"
#include <array>
#include <cstdint>
#include <cstddef>
#include <span>
 
namespace openmsx {
 
template<std::unsigned_integral Pixel> class Multiply;
 
template<> class Multiply<uint16_t>
{
public:
        explicit Multiply(const PixelOperations<uint16_t>& pixelOps);
        void setFactor(unsigned f);
        [[nodiscard]] inline uint16_t multiply(uint16_t p, unsigned factor) const;
        [[nodiscard]] inline uint16_t multiply(uint16_t p) const;
        [[nodiscard]] inline std::span<const uint16_t, 0x10000> getTable() const { return tab; }
private:
        const PixelOperations<uint16_t>& pixelOps;
        unsigned factor = 0;
        std::array<uint16_t, 0x10000> tab = {};
};
 
template<> class Multiply<uint32_t>
{
public:
        explicit Multiply(const PixelOperations<uint32_t>& pixelOps);
        void setFactor(unsigned f);
        [[nodiscard]] inline uint32_t multiply(uint32_t p, unsigned factor) const;
        [[nodiscard]] inline uint32_t multiply(uint32_t p) const;
private:
        unsigned factor;
};
 
template<std::unsigned_integral Pixel> class Scanline
{
public:
        explicit Scanline(const PixelOperations<Pixel>& pixelOps);
 
        void draw(std::span<const Pixel> src1, std::span<const Pixel> src2,
                  std::span<Pixel> dst, unsigned factor);
 
        [[nodiscard]] Pixel darken(Pixel p, unsigned factor) const;
 
        [[nodiscard]] Pixel darken(Pixel p1, Pixel p2, unsigned factor) const;
 
private:
        Multiply<Pixel> darkener;
        PixelOperations<Pixel> pixelOps;
};
 
} // namespace openmsx
 
#endif