ScalerOutput.hh

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#ifndef SCALEROUTPUT_HH
#define SCALEROUTPUT_HH
 
#include <concepts>
#include <span>
 
namespace openmsx {
 
template<std::unsigned_integral Pixel> class ScalerOutput
{
public:
        virtual ~ScalerOutput() = default;
 
        [[nodiscard]] virtual unsigned getWidth()  const = 0;
        [[nodiscard]] virtual unsigned getHeight() const = 0;
 
        virtual void frameStart() = 0;
        virtual void frameStop() = 0;
 
        [[nodiscard]] virtual std::span<Pixel> acquireLine(unsigned y) = 0;
        virtual void releaseLine(unsigned y, std::span<Pixel> buf) = 0;
        virtual void fillLine   (unsigned y, Pixel color) = 0;
        // TODO add copyLine() optimization
 
protected:
        ScalerOutput() = default;
};
 
} // namespace openmsx
 
#endif