StretchScalerOutput.cc

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#include "StretchScalerOutput.hh"
#include "DirectScalerOutput.hh"
#include "LineScalers.hh"
#include "PixelOperations.hh"
#include "MemoryOps.hh"
#include "build-info.hh"
#include <cstdint>
#include <memory>
#include <vector>
 
namespace openmsx {
 
template<std::unsigned_integral Pixel>
class StretchScalerOutputBase : public ScalerOutput<Pixel>
{
public:
        StretchScalerOutputBase(SDLOutputSurface& out,
                                PixelOperations<Pixel> pixelOps);
        ~StretchScalerOutputBase() override;
        StretchScalerOutputBase(const StretchScalerOutputBase&) = delete;
        StretchScalerOutputBase& operator=(const StretchScalerOutputBase&) = delete;
 
        [[nodiscard]] unsigned getWidth()  const final;
        [[nodiscard]] unsigned getHeight() const final;
 
        void frameStart() final { output.frameStart(); }
        void frameStop()  final { output.frameStop();  }
 
        [[nodiscard]] std::span<Pixel> acquireLine(unsigned y) final;
        void fillLine(unsigned y, Pixel color) override;
 
protected:
        [[nodiscard]] std::span<Pixel> releasePre(unsigned y, std::span<Pixel> buf);
        void releasePost(unsigned y, std::span<Pixel> dstLine);
 
        const PixelOperations<Pixel> pixelOps;
 
private:
        DirectScalerOutput<Pixel> output;
        std::vector<Pixel*> pool;
};
 
template<std::unsigned_integral Pixel>
class StretchScalerOutput final : public StretchScalerOutputBase<Pixel>
{
public:
        StretchScalerOutput(SDLOutputSurface& out,
                            PixelOperations<Pixel> pixelOps,
                            unsigned inWidth);
        void releaseLine(unsigned y, std::span<Pixel> buf) override;
 
private:
        unsigned inWidth;
};
 
template<std::unsigned_integral Pixel, unsigned IN_WIDTH, typename SCALE>
class StretchScalerOutputN : public StretchScalerOutputBase<Pixel>
{
public:
        StretchScalerOutputN(SDLOutputSurface& out,
                             PixelOperations<Pixel> pixelOps);
        void releaseLine(unsigned y, std::span<Pixel> buf) override;
};
 
template<std::unsigned_integral Pixel>
class StretchScalerOutput256 final
        : public StretchScalerOutputN<Pixel, 256, Scale_4on5<Pixel>>
{
public:
        StretchScalerOutput256(SDLOutputSurface& out,
                               PixelOperations<Pixel> pixelOps);
};
 
template<std::unsigned_integral Pixel>
class StretchScalerOutput272 final
        : public StretchScalerOutputN<Pixel, 272, Scale_17on20<Pixel>>
{
public:
        StretchScalerOutput272(SDLOutputSurface& out,
                               PixelOperations<Pixel> pixelOps);
};
 
template<std::unsigned_integral Pixel>
class StretchScalerOutput280 final
        : public StretchScalerOutputN<Pixel, 280, Scale_7on8<Pixel>>
{
public:
        StretchScalerOutput280(SDLOutputSurface& out,
                               PixelOperations<Pixel> pixelOps);
};
 
template<std::unsigned_integral Pixel>
class StretchScalerOutput288 final
        : public StretchScalerOutputN<Pixel, 288, Scale_9on10<Pixel>>
{
public:
        StretchScalerOutput288(SDLOutputSurface& out,
                               PixelOperations<Pixel> pixelOps);
};
 
 
// class StretchScalerOutputBase
 
template<std::unsigned_integral Pixel>
StretchScalerOutputBase<Pixel>::StretchScalerOutputBase(
                SDLOutputSurface& out,
                PixelOperations<Pixel> pixelOps_)
        : pixelOps(std::move(pixelOps_))
        , output(out)
{
}
 
template<std::unsigned_integral Pixel>
StretchScalerOutputBase<Pixel>::~StretchScalerOutputBase()
{
        for (auto& p : pool) {
                MemoryOps::freeAligned(p);
        }
}
 
template<std::unsigned_integral Pixel>
unsigned StretchScalerOutputBase<Pixel>::getWidth() const
{
        return output.getWidth();
}
 
template<std::unsigned_integral Pixel>
unsigned StretchScalerOutputBase<Pixel>::getHeight() const
{
        return output.getHeight();
}
 
template<std::unsigned_integral Pixel>
std::span<Pixel> StretchScalerOutputBase<Pixel>::acquireLine(unsigned /*y*/)
{
        auto width = getWidth();
        if (!pool.empty()) {
                Pixel* buf = pool.back();
                pool.pop_back();
                return {buf, width};
        } else {
                unsigned size = sizeof(Pixel) * width;
                return {static_cast<Pixel*>(MemoryOps::mallocAligned(64, size)),
                        width};
        }
}
 
template<std::unsigned_integral Pixel>
std::span<Pixel> StretchScalerOutputBase<Pixel>::releasePre(unsigned y, std::span<Pixel> buf)
{
        assert(buf.size() == getWidth());
        pool.push_back(buf.data());
        return output.acquireLine(y);
}
 
template<std::unsigned_integral Pixel>
void StretchScalerOutputBase<Pixel>::releasePost(unsigned y, std::span<Pixel> dstLine)
{
        output.releaseLine(y, dstLine);
}
 
template<std::unsigned_integral Pixel>
void StretchScalerOutputBase<Pixel>::fillLine(unsigned y, Pixel color)
{
        MemoryOps::MemSet<Pixel> memset;
        auto dstLine = output.acquireLine(y);
        memset(dstLine, color);
        output.releaseLine(y, dstLine);
}
 
 
// class StretchScalerOutput
 
template<std::unsigned_integral Pixel>
StretchScalerOutput<Pixel>::StretchScalerOutput(
                SDLOutputSurface& out,
                PixelOperations<Pixel> pixelOps_,
                unsigned inWidth_)
        : StretchScalerOutputBase<Pixel>(out, std::move(pixelOps_))
        , inWidth(inWidth_)
{
}
 
template<std::unsigned_integral Pixel>
void StretchScalerOutput<Pixel>::releaseLine(unsigned y, std::span<Pixel> buf)
{
        auto dstLine = this->releasePre(y, buf);
        auto dstWidth = dstLine.size();
 
        auto srcWidth = (dstWidth / 320) * inWidth;
        auto srcOffset = (dstWidth - srcWidth) / 2;
        ZoomLine<Pixel> zoom(this->pixelOps);
        zoom(buf.subspan(srcOffset, srcWidth), dstLine);
 
        this->releasePost(y, dstLine);
}
 
 
// class StretchScalerOutputN
 
template<std::unsigned_integral Pixel, unsigned IN_WIDTH, typename SCALE>
StretchScalerOutputN<Pixel, IN_WIDTH, SCALE>::StretchScalerOutputN(
                SDLOutputSurface& out,
                PixelOperations<Pixel> pixelOps_)
        : StretchScalerOutputBase<Pixel>(out, std::move(pixelOps_))
{
}
 
template<std::unsigned_integral Pixel, unsigned IN_WIDTH, typename SCALE>
void StretchScalerOutputN<Pixel, IN_WIDTH, SCALE>::releaseLine(unsigned y, std::span<Pixel> buf)
{
        auto dstLine = this->releasePre(y, buf);
        auto dstWidth = dstLine.size();
 
        auto srcWidth = (dstWidth / 320) * IN_WIDTH;
        auto srcOffset = (dstWidth - srcWidth) / 2;
        SCALE scale(this->pixelOps);
        scale(buf.subspan(srcOffset, srcWidth), dstLine);
 
        this->releasePost(y, dstLine);
}
 
 
// class StretchScalerOutput256
 
template<std::unsigned_integral Pixel>
StretchScalerOutput256<Pixel>::StretchScalerOutput256(
                SDLOutputSurface& out,
                PixelOperations<Pixel> pixelOps_)
        : StretchScalerOutputN<Pixel, 256, Scale_4on5<Pixel>>(
                out, std::move(pixelOps_))
{
}
 
 
// class StretchScalerOutput272
 
template<std::unsigned_integral Pixel>
StretchScalerOutput272<Pixel>::StretchScalerOutput272(
                SDLOutputSurface& out,
                PixelOperations<Pixel> pixelOps_)
        : StretchScalerOutputN<Pixel, 272, Scale_17on20<Pixel>>(
                out, std::move(pixelOps_))
{
}
 
 
// class StretchScalerOutput280
 
template<std::unsigned_integral Pixel>
StretchScalerOutput280<Pixel>::StretchScalerOutput280(
                SDLOutputSurface& out,
                PixelOperations<Pixel> pixelOps_)
        : StretchScalerOutputN<Pixel, 280, Scale_7on8<Pixel>>(
                out, std::move(pixelOps_))
{
}
 
 
// class StretchScalerOutput288
 
template<std::unsigned_integral Pixel>
StretchScalerOutput288<Pixel>::StretchScalerOutput288(
                SDLOutputSurface& out,
                PixelOperations<Pixel> pixelOps_)
        : StretchScalerOutputN<Pixel, 288, Scale_9on10<Pixel>>(
                out, std::move(pixelOps_))
{
}
 
 
// class StretchScalerOutputFactory
 
template<std::unsigned_integral Pixel>
std::unique_ptr<ScalerOutput<Pixel>> StretchScalerOutputFactory<Pixel>::create(
        SDLOutputSurface& output,
        PixelOperations<Pixel> pixelOps,
        unsigned inWidth)
{
        switch (inWidth) {
        case 320:
                return std::make_unique<DirectScalerOutput<Pixel>>(output);
        case 288:
                return std::make_unique<StretchScalerOutput288<Pixel>>(
                        output, std::move(pixelOps));
        case 280:
                return std::make_unique<StretchScalerOutput280<Pixel>>(
                        output, std::move(pixelOps));
        case 272:
                return std::make_unique<StretchScalerOutput272<Pixel>>(
                        output, std::move(pixelOps));
        case 256:
                return std::make_unique<StretchScalerOutput256<Pixel>>(
                        output, std::move(pixelOps));
        default:
                return std::make_unique<StretchScalerOutput<Pixel>>(
                        output, std::move(pixelOps), inWidth);
        }
}
 
// Force template instantiation.
#if HAVE_16BPP
template struct StretchScalerOutputFactory<uint16_t>;
#endif
#if HAVE_32BPP
template struct StretchScalerOutputFactory<uint32_t>;
#endif
 
} // namespace openmsx