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>

using std::unique_ptr;

namespace openmsx {

template<typename Pixel>
class StretchScalerOutputBase : public ScalerOutput<Pixel>
{
public:
        StretchScalerOutputBase(unique_ptr<ScalerOutput<Pixel>> output,
                                PixelOperations<Pixel> pixelOps);
        ~StretchScalerOutputBase() override;

        unsigned getWidth()  const override;
        unsigned getHeight() const override;
        Pixel* acquireLine(unsigned y) override;
        void   fillLine   (unsigned y, Pixel color) override;

protected:
        Pixel* releasePre(unsigned y, Pixel* buf);
        void releasePost(unsigned y, Pixel* dstLine);

        const PixelOperations<Pixel> pixelOps;

private:
        unique_ptr<ScalerOutput<Pixel>> output;
        std::vector<Pixel*> pool;
};

template<typename Pixel>
class StretchScalerOutput : public StretchScalerOutputBase<Pixel>
{
public:
        StretchScalerOutput(unique_ptr<ScalerOutput<Pixel>> output,
                            PixelOperations<Pixel> pixelOps,
                            unsigned inWidth);
        void releaseLine(unsigned y, Pixel* buf) override;

private:
        unsigned inWidth;
};

template<typename Pixel, unsigned IN_WIDTH, typename SCALE>
class StretchScalerOutputN : public StretchScalerOutputBase<Pixel>
{
public:
        StretchScalerOutputN(unique_ptr<ScalerOutput<Pixel>> output,
                             PixelOperations<Pixel> pixelOps);
        void releaseLine(unsigned y, Pixel* buf) override;
};

template<typename Pixel>
class StretchScalerOutput256
        : public StretchScalerOutputN<Pixel, 256, Scale_4on5<Pixel>>
{
public:
        StretchScalerOutput256(unique_ptr<ScalerOutput<Pixel>> output,
                               PixelOperations<Pixel> pixelOps);
};

template<typename Pixel>
class StretchScalerOutput272
        : public StretchScalerOutputN<Pixel, 272, Scale_17on20<Pixel>>
{
public:
        StretchScalerOutput272(unique_ptr<ScalerOutput<Pixel>> output,
                               PixelOperations<Pixel> pixelOps);
};

template<typename Pixel>
class StretchScalerOutput280
        : public StretchScalerOutputN<Pixel, 280, Scale_7on8<Pixel>>
{
public:
        StretchScalerOutput280(unique_ptr<ScalerOutput<Pixel>> output,
                               PixelOperations<Pixel> pixelOps);
};

template<typename Pixel>
class StretchScalerOutput288
        : public StretchScalerOutputN<Pixel, 288, Scale_9on10<Pixel>>
{
public:
        StretchScalerOutput288(unique_ptr<ScalerOutput<Pixel>> output,
                               PixelOperations<Pixel> pixelOps);
};


// class StretchScalerOutputBase

template<typename Pixel>
StretchScalerOutputBase<Pixel>::StretchScalerOutputBase(
                unique_ptr<ScalerOutput<Pixel>> output_,
                PixelOperations<Pixel> pixelOps_)
        : pixelOps(std::move(pixelOps_))
        , output(std::move(output_))
{
}

template<typename Pixel>
StretchScalerOutputBase<Pixel>::~StretchScalerOutputBase()
{
        for (auto& p : pool) {
                MemoryOps::freeAligned(p);
        }
}

template<typename Pixel>
unsigned StretchScalerOutputBase<Pixel>::getWidth() const
{
        return output->getWidth();
}

template<typename Pixel>
unsigned StretchScalerOutputBase<Pixel>::getHeight() const
{
        return output->getHeight();
}

template<typename Pixel>
Pixel* StretchScalerOutputBase<Pixel>::acquireLine(unsigned /*y*/)
{
        if (!pool.empty()) {
                Pixel* buf = pool.back();
                pool.pop_back();
                return buf;
        } else {
                unsigned size = sizeof(Pixel) * output->getWidth();
                return static_cast<Pixel*>(MemoryOps::mallocAligned(64, size));
        }
}

template<typename Pixel>
Pixel* StretchScalerOutputBase<Pixel>::releasePre(unsigned y, Pixel* buf)
{
        pool.push_back(buf);
        return output->acquireLine(y);
}

template<typename Pixel>
void StretchScalerOutputBase<Pixel>::releasePost(unsigned y, Pixel* dstLine)
{
        output->releaseLine(y, dstLine);
}

template<typename Pixel>
void StretchScalerOutputBase<Pixel>::fillLine(unsigned y, Pixel color)
{
        Pixel* dstLine = output->acquireLine(y);
        MemoryOps::MemSet<Pixel> memset;
        memset(dstLine, output->getWidth(), color);
        output->releaseLine(y, dstLine);
}


// class StretchScalerOutput

template<typename Pixel>
StretchScalerOutput<Pixel>::StretchScalerOutput(
                unique_ptr<ScalerOutput<Pixel>> output_,
                PixelOperations<Pixel> pixelOps_,
                unsigned inWidth_)
        : StretchScalerOutputBase<Pixel>(std::move(output_), std::move(pixelOps_))
        , inWidth(inWidth_)
{
}

template<typename Pixel>
void StretchScalerOutput<Pixel>::releaseLine(unsigned y, Pixel* buf)
{
        Pixel* dstLine = this->releasePre(y, buf);

        unsigned dstWidth = StretchScalerOutputBase<Pixel>::getWidth();
        unsigned srcWidth = (dstWidth / 320) * inWidth;
        unsigned srcOffset = (dstWidth - srcWidth) / 2;
        ZoomLine<Pixel> zoom(this->pixelOps);
        zoom(buf + srcOffset, srcWidth, dstLine, dstWidth);

        this->releasePost(y, dstLine);
}


// class StretchScalerOutputN

template<typename Pixel, unsigned IN_WIDTH, typename SCALE>
StretchScalerOutputN<Pixel, IN_WIDTH, SCALE>::StretchScalerOutputN(
                unique_ptr<ScalerOutput<Pixel>> output_,
                PixelOperations<Pixel> pixelOps_)
        : StretchScalerOutputBase<Pixel>(std::move(output_), std::move(pixelOps_))
{
}

template<typename Pixel, unsigned IN_WIDTH, typename SCALE>
void StretchScalerOutputN<Pixel, IN_WIDTH, SCALE>::releaseLine(unsigned y, Pixel* buf)
{
        Pixel* dstLine = this->releasePre(y, buf);

        unsigned dstWidth = StretchScalerOutputBase<Pixel>::getWidth();
        unsigned srcWidth = (dstWidth / 320) * IN_WIDTH;
        unsigned srcOffset = (dstWidth - srcWidth) / 2;
        SCALE scale(this->pixelOps);
        scale(buf + srcOffset, dstLine, dstWidth);

        this->releasePost(y, dstLine);
}


// class StretchScalerOutput256

template<typename Pixel>
StretchScalerOutput256<Pixel>::StretchScalerOutput256(
                unique_ptr<ScalerOutput<Pixel>> output_,
                PixelOperations<Pixel> pixelOps_)
        : StretchScalerOutputN<Pixel, 256, Scale_4on5<Pixel>>(
                std::move(output_), std::move(pixelOps_))
{
}


// class StretchScalerOutput272

template<typename Pixel>
StretchScalerOutput272<Pixel>::StretchScalerOutput272(
                unique_ptr<ScalerOutput<Pixel>> output_,
                PixelOperations<Pixel> pixelOps_)
        : StretchScalerOutputN<Pixel, 272, Scale_17on20<Pixel>>(
                std::move(output_), std::move(pixelOps_))
{
}


// class StretchScalerOutput280

template<typename Pixel>
StretchScalerOutput280<Pixel>::StretchScalerOutput280(
                unique_ptr<ScalerOutput<Pixel>> output_,
                PixelOperations<Pixel> pixelOps_)
        : StretchScalerOutputN<Pixel, 280, Scale_7on8<Pixel>>(
                std::move(output_), std::move(pixelOps_))
{
}


// class StretchScalerOutput288

template<typename Pixel>
StretchScalerOutput288<Pixel>::StretchScalerOutput288(
                unique_ptr<ScalerOutput<Pixel>> output_,
                PixelOperations<Pixel> pixelOps_)
        : StretchScalerOutputN<Pixel, 288, Scale_9on10<Pixel>>(
                std::move(output_), std::move(pixelOps_))
{
}


// class StretchScalerOutputFactory

template<typename Pixel>
unique_ptr<ScalerOutput<Pixel>> StretchScalerOutputFactory<Pixel>::create(
        OutputSurface& output,
        PixelOperations<Pixel> pixelOps,
        unsigned inWidth)
{
        auto direct = std::make_unique<DirectScalerOutput<Pixel>>(output);
        switch (inWidth) {
        case 320:
                return direct;
        case 288:
                return std::make_unique<StretchScalerOutput288<Pixel>>(
                        std::move(direct), std::move(pixelOps));
        case 280:
                return std::make_unique<StretchScalerOutput280<Pixel>>(
                        std::move(direct), std::move(pixelOps));
        case 272:
                return std::make_unique<StretchScalerOutput272<Pixel>>(
                        std::move(direct), std::move(pixelOps));
        case 256:
                return std::make_unique<StretchScalerOutput256<Pixel>>(
                        std::move(direct), std::move(pixelOps));
        default:
                return std::make_unique<StretchScalerOutput<Pixel>>(
                        std::move(direct), 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