RawFrame.hh

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#ifndef RAWFRAME_HH
#define RAWFRAME_HH

#include "FrameSource.hh"
#include "MemBuffer.hh"
#include "openmsx.hh"
#include <cassert>

namespace openmsx {

// Used by SDLRasterizer to implement left/right border drawing optimization.
struct V9958RasterizerBorderInfo
{
        uint32_t color0, color1;
        byte mode = 0xff; // invalid mode
        byte adjust;
        byte scroll;
        bool masked;
};


class RawFrame final : public FrameSource
{
public:
        RawFrame(const SDL_PixelFormat& format, unsigned maxWidth, unsigned height);

        template<typename Pixel>
        Pixel* getLinePtrDirect(unsigned y) {
                return reinterpret_cast<Pixel*>(data.data() + y * pitch);
        }

        unsigned getLineWidthDirect(unsigned y) const {
                return lineWidths[y];
        }

        inline void setLineWidth(unsigned line, unsigned width) {
                assert(line < getHeight());
                assert(width <= maxWidth);
                lineWidths[line] = width;
        }

        template <class Pixel>
        inline void setBlank(unsigned line, Pixel color) {
                assert(line < getHeight());
                auto* pixels = getLinePtrDirect<Pixel>(line);
                pixels[0] = color;
                lineWidths[line] = 1;
        }

        unsigned getRowLength() const override;

        // RawFrame is mostly agnostic of the border info struct. The only
        // thing it does is store the information and give access to it.
        V9958RasterizerBorderInfo& getBorderInfo() { return borderInfo; }

protected:
        unsigned getLineWidth(unsigned line) const override;
        const void* getLineInfo(
                unsigned line, unsigned& width,
                void* buf, unsigned bufWidth) const override;
        bool hasContiguousStorage() const override;

private:
        MemBuffer<char, 64> data;
        MemBuffer<unsigned> lineWidths;
        unsigned maxWidth;
        unsigned pitch;

        V9958RasterizerBorderInfo borderInfo;
};

} // namespace openmsx

#endif