DirectScalerOutput.hh

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#ifndef DIRECTSCALEROUTPUT_HH
#define DIRECTSCALEROUTPUT_HH
 
#include "ScalerOutput.hh"
#include "SDLOutputSurface.hh"
#include <concepts>
#include <optional>
 
namespace openmsx {
 
template<std::unsigned_integral Pixel>
class DirectScalerOutput final : public ScalerOutput<Pixel>
{
public:
        explicit DirectScalerOutput(SDLOutputSurface& output);
 
        [[nodiscard]] unsigned getWidth()  const override {
                return output.getLogicalWidth();
        }
        [[nodiscard]] unsigned getHeight() const override {
                return output.getLogicalHeight();
        }
 
        void frameStart() override {
                pixelAccess.emplace(output.getDirectPixelAccess());
        }
        void frameStop() override {
                pixelAccess.reset();
        }
 
        [[nodiscard]] std::span<Pixel> acquireLine(unsigned y) override;
        void releaseLine(unsigned y, std::span<Pixel> buf) override;
        void fillLine   (unsigned y, Pixel color) override;
 
private:
        SDLOutputSurface& output;
        std::optional<SDLDirectPixelAccess> pixelAccess;
};
 
} // namespace openmsx
 
#endif