SuperImposeScalerOutput.cc

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#include "SuperImposeScalerOutput.hh"
#include "RawFrame.hh"
#include "LineScalers.hh"
#include "MemoryOps.hh"
#include "unreachable.hh"
#include "vla.hh"
#include "build-info.hh"
#include <cstdint>

namespace openmsx {

template<typename Pixel>
SuperImposeScalerOutput<Pixel>::SuperImposeScalerOutput(
                ScalerOutput<Pixel>& output_,
                const RawFrame& superImpose_,
                const PixelOperations<Pixel>& pixelOps_)
        : output(output_)
        , superImpose(superImpose_)
        , pixelOps(pixelOps_)
{
}

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

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

template<typename Pixel>
Pixel* SuperImposeScalerOutput<Pixel>::acquireLine(unsigned y)
{
        return output.acquireLine(y);
}

template<typename Pixel>
void SuperImposeScalerOutput<Pixel>::releaseLine(unsigned y, Pixel* buf)
{
        unsigned width = output.getWidth();
        VLA_SSE_ALIGNED(Pixel, buf2, width);
        auto* srcLine = getSrcLine(y, buf2);
        AlphaBlendLines<Pixel> alphaBlend(pixelOps);
        alphaBlend(buf, srcLine, buf, width);
        output.releaseLine(y, buf);
}

template<typename Pixel>
void SuperImposeScalerOutput<Pixel>::fillLine(unsigned y, Pixel color)
{
        auto* dstLine = output.acquireLine(y);
        unsigned width = output.getWidth();
        if (pixelOps.isFullyOpaque(color)) {
                MemoryOps::MemSet<Pixel> memset;
                memset(dstLine, width, color);
        } else {
                auto* srcLine = getSrcLine(y, dstLine);
                if (pixelOps.isFullyTransparent(color)) {
                        // optimization: use destination as work buffer, in case
                        // that buffer got used, we don't need to make a copy
                        // anymore
                        if (srcLine != dstLine) {
                                Scale_1on1<Pixel> copy;
                                copy(srcLine, dstLine, width);
                        }
                } else {
                        AlphaBlendLines<Pixel> alphaBlend(pixelOps);
                        alphaBlend(color, srcLine, dstLine, width); // possibly srcLine == dstLine
                }
        }
        output.releaseLine(y, dstLine);
}

template<typename Pixel>
const Pixel* SuperImposeScalerOutput<Pixel>::getSrcLine(unsigned y, Pixel* buf)
{
        unsigned width = output.getWidth();
        if (width == 320) {
                return superImpose.getLinePtr320_240(y, buf);
        } else if (width == 640) {
                return superImpose.getLinePtr640_480(y, buf);
        } else if (width == 960) {
                return superImpose.getLinePtr960_720(y, buf);
        } else {
                UNREACHABLE; return nullptr;
        }
}


// Force template instantiation.
#if HAVE_16BPP
template class SuperImposeScalerOutput<uint16_t>;
#endif
#if HAVE_32BPP
template class SuperImposeScalerOutput<uint32_t>;
#endif

} // namespace openmsx