RGBTriplet3xScaler.cc

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#include "RGBTriplet3xScaler.hh"
#include "SuperImposedVideoFrame.hh"
#include "LineScalers.hh"
#include "RawFrame.hh"
#include "ScalerOutput.hh"
#include "RenderSettings.hh"
#include "enumerate.hh"
#include "vla.hh"
#include "build-info.hh"
#include <array>
#include <cstdint>
 
namespace openmsx {
 
template<std::unsigned_integral Pixel>
RGBTriplet3xScaler<Pixel>::RGBTriplet3xScaler(
                const PixelOperations<Pixel>& pixelOps_,
                const RenderSettings& renderSettings)
        : Scaler3<Pixel>(pixelOps_)
        , pixelOps(pixelOps_)
        , scanline(pixelOps_)
        , settings(renderSettings)
{
}
 
template<std::unsigned_integral Pixel>
std::pair<unsigned, unsigned> RGBTriplet3xScaler<Pixel>::calcBlur()
{
        unsigned c1 = settings.getBlurFactor();
        unsigned c2 = (3 * 256) - (2 * c1);
        return {c1, c2};
}
 
[[nodiscard]] static inline std::pair<unsigned, unsigned> calcSpill(unsigned c1, unsigned c2, unsigned x)
{
        unsigned r = (c2 * x) >> 8;
        unsigned s = (c1 * x) >> 8;
        if (r > 255) {
                s += (r - 255) / 2;
                r = 255;
        }
        return {r, s};
}
 
template<std::unsigned_integral Pixel>
void RGBTriplet3xScaler<Pixel>::rgbify(
        std::span<const Pixel> in, std::span<Pixel> out, unsigned c1, unsigned c2)
{
        assert((3 * in.size()) == out.size());
        auto inSize = in.size();
        size_t i = 0;
 
        auto    [r, rs] = calcSpill(c1, c2, pixelOps.red256  (in[i + 0]));
        auto    [g, gs] = calcSpill(c1, c2, pixelOps.green256(in[i + 0]));
        out[3 * i + 0] = pixelOps.combine256(r , gs, 0);
        auto    [b, bs] = calcSpill(c1, c2, pixelOps.blue256 (in[i + 0]));
        out[3 * i + 1] = pixelOps.combine256(rs, g , bs);
        std::tie(r, rs) = calcSpill(c1, c2, pixelOps.red256  (in[i + 1]));
        out[3 * i + 2] = pixelOps.combine256(rs, gs, b);
 
        for (++i; i < (inSize - 1); ++i) {
                std::tie(g, gs) = calcSpill(c1, c2, pixelOps.green256(in[i + 0]));
                out[3 * i + 0] = pixelOps.combine256(r , gs, bs);
                std::tie(b, bs) = calcSpill(c1, c2, pixelOps.blue256 (in[i + 0]));
                out[3 * i + 1] = pixelOps.combine256(rs, g , bs);
                std::tie(r, rs) = calcSpill(c1, c2, pixelOps.red256  (in[i + 1]));
                out[3 * i + 2] = pixelOps.combine256(rs, gs, b);
        }
 
        std::tie(g, gs) = calcSpill(c1, c2, pixelOps.green256(in[i + 0]));
        out[3 * i + 0] = pixelOps.combine256(r , gs, bs);
        std::tie(b, bs) = calcSpill(c1, c2, pixelOps.blue256 (in[i + 0]));
        out[3 * i + 1] = pixelOps.combine256(rs, g , bs);
        out[3 * i + 2] = pixelOps.combine256(0 , gs, b);
}
 
template<std::unsigned_integral Pixel>
void RGBTriplet3xScaler<Pixel>::scaleLine(
        std::span<const Pixel> srcLine, std::span<Pixel> dstLine, PolyLineScaler<Pixel>& scale,
        unsigned c1, unsigned c2)
{
        if (scale.isCopy()) {
                rgbify(srcLine, dstLine, c1, c2);
        } else {
                VLA_SSE_ALIGNED(Pixel, tmp, dstLine.size() / 3);
                scale(srcLine, tmp);
                rgbify(tmp, dstLine, c1, c2);
        }
}
 
// Note: the idea is that this method RGBifies a line that is first scaled
// to output-width / 3. So, when calling this, keep this in mind and pass a
// scale functor that scales the input with correctly.
template<std::unsigned_integral Pixel>
void RGBTriplet3xScaler<Pixel>::doScale1(FrameSource& src,
        unsigned srcStartY, unsigned /*srcEndY*/, unsigned srcWidth,
        ScalerOutput<Pixel>& dst, unsigned dstStartY, unsigned dstEndY,
        PolyLineScaler<Pixel>& scale)
{
        VLA_SSE_ALIGNED(Pixel, buf, srcWidth);
 
        auto [c1, c2] = calcBlur();
 
        unsigned dstWidth = dst.getWidth();
        int scanlineFactor = settings.getScanlineFactor();
        unsigned y = dstStartY;
        auto srcLine = src.getLine(srcStartY++, buf);
        auto dstLine0 = dst.acquireLine(y + 0);
        scaleLine(srcLine, dstLine0, scale, c1, c2);
 
        Scale_1on1<Pixel> copy;
        auto dstLine1 = dst.acquireLine(y + 1);
        copy(dstLine0, dstLine1);
 
        for (/* */; (y + 4) < dstEndY; y += 3, srcStartY += 1) {
                srcLine = src.getLine(srcStartY, buf);
                auto dstLine3 = dst.acquireLine(y + 3);
                scaleLine(srcLine, dstLine3, scale, c1, c2);
 
                auto dstLine4 = dst.acquireLine(y + 4);
                copy(dstLine3, dstLine4);
 
                auto dstLine2 = dst.acquireLine(y + 2);
                scanline.draw(dstLine0, dstLine3,
                              dstLine2, scanlineFactor);
 
                dst.releaseLine(y + 0, dstLine0);
                dst.releaseLine(y + 1, dstLine1);
                dst.releaseLine(y + 2, dstLine2);
                dstLine0 = dstLine3;
                dstLine1 = dstLine4;
        }
 
        srcLine = src.getLine(srcStartY, buf);
        VLA_SSE_ALIGNED(Pixel, buf2, dstWidth);
        scaleLine(srcLine, buf2, scale, c1, c2);
        auto dstLine2 = dst.acquireLine(y + 2);
        scanline.draw(dstLine0, buf2, dstLine2, scanlineFactor);
        dst.releaseLine(y + 0, dstLine0);
        dst.releaseLine(y + 1, dstLine1);
        dst.releaseLine(y + 2, dstLine2);
}
 
template<std::unsigned_integral Pixel>
void RGBTriplet3xScaler<Pixel>::doScale2(FrameSource& src,
        unsigned srcStartY, unsigned /*srcEndY*/, unsigned srcWidth,
        ScalerOutput<Pixel>& dst, unsigned dstStartY, unsigned dstEndY,
        PolyLineScaler<Pixel>& scale)
{
        VLA_SSE_ALIGNED(Pixel, buf, srcWidth);
        auto [c1, c2] = calcBlur();
 
        int scanlineFactor = settings.getScanlineFactor();
        for (unsigned srcY = srcStartY, dstY = dstStartY; dstY < dstEndY;
             srcY += 2, dstY += 3) {
                auto srcLine0 = src.getLine(srcY + 0, buf);
                auto dstLine0 = dst.acquireLine(dstY + 0);
                scaleLine(srcLine0, dstLine0, scale, c1, c2);
 
                auto srcLine1 = src.getLine(srcY + 1, buf);
                auto dstLine2 = dst.acquireLine(dstY + 2);
                scaleLine(srcLine1, dstLine2, scale, c1, c2);
 
                auto dstLine1 = dst.acquireLine(dstY + 1);
                scanline.draw(dstLine0, dstLine2,
                              dstLine1, scanlineFactor);
 
                dst.releaseLine(dstY + 0, dstLine0);
                dst.releaseLine(dstY + 1, dstLine1);
                dst.releaseLine(dstY + 2, dstLine2);
        }
}
 
template<std::unsigned_integral Pixel>
void RGBTriplet3xScaler<Pixel>::scale2x1to9x3(FrameSource& src,
        unsigned srcStartY, unsigned srcEndY, unsigned srcWidth,
        ScalerOutput<Pixel>& dst, unsigned dstStartY, unsigned dstEndY)
{
        PolyScale<Pixel, Scale_2on3<Pixel>> op(pixelOps);
        doScale1(src, srcStartY, srcEndY, srcWidth,
                 dst, dstStartY, dstEndY, op);
}
 
template<std::unsigned_integral Pixel>
void RGBTriplet3xScaler<Pixel>::scale2x2to9x3(FrameSource& src,
        unsigned srcStartY, unsigned srcEndY, unsigned srcWidth,
        ScalerOutput<Pixel>& dst, unsigned dstStartY, unsigned dstEndY)
{
        PolyScale<Pixel, Scale_2on3<Pixel>> op(pixelOps);
        doScale2(src, srcStartY, srcEndY, srcWidth,
                 dst, dstStartY, dstEndY, op);
}
 
template<std::unsigned_integral Pixel>
void RGBTriplet3xScaler<Pixel>::scale1x1to3x3(FrameSource& src,
        unsigned srcStartY, unsigned srcEndY, unsigned srcWidth,
        ScalerOutput<Pixel>& dst, unsigned dstStartY, unsigned dstEndY)
{
        PolyScale<Pixel, Scale_1on1<Pixel>> op;
        doScale1(src, srcStartY, srcEndY, srcWidth,
                 dst, dstStartY, dstEndY, op);
}
 
template<std::unsigned_integral Pixel>
void RGBTriplet3xScaler<Pixel>::scale1x2to3x3(FrameSource& src,
        unsigned srcStartY, unsigned srcEndY, unsigned srcWidth,
        ScalerOutput<Pixel>& dst, unsigned dstStartY, unsigned dstEndY)
{
        PolyScale<Pixel, Scale_1on1<Pixel>> op;
        doScale2(src, srcStartY, srcEndY, srcWidth,
                 dst, dstStartY, dstEndY, op);
}
 
template<std::unsigned_integral Pixel>
void RGBTriplet3xScaler<Pixel>::scale4x1to9x3(FrameSource& src,
        unsigned srcStartY, unsigned srcEndY, unsigned srcWidth,
        ScalerOutput<Pixel>& dst, unsigned dstStartY, unsigned dstEndY)
{
        PolyScale<Pixel, Scale_4on3<Pixel>> op(pixelOps);
        doScale1(src, srcStartY, srcEndY, srcWidth,
                 dst, dstStartY, dstEndY, op);
}
 
template<std::unsigned_integral Pixel>
void RGBTriplet3xScaler<Pixel>::scale4x2to9x3(FrameSource& src,
        unsigned srcStartY, unsigned srcEndY, unsigned srcWidth,
        ScalerOutput<Pixel>& dst, unsigned dstStartY, unsigned dstEndY)
{
        PolyScale<Pixel, Scale_4on3<Pixel>> op(pixelOps);
        doScale2(src, srcStartY, srcEndY, srcWidth,
                 dst, dstStartY, dstEndY, op);
}
 
template<std::unsigned_integral Pixel>
void RGBTriplet3xScaler<Pixel>::scale2x1to3x3(FrameSource& src,
        unsigned srcStartY, unsigned srcEndY, unsigned srcWidth,
        ScalerOutput<Pixel>& dst, unsigned dstStartY, unsigned dstEndY)
{
        PolyScale<Pixel, Scale_2on1<Pixel>> op(pixelOps);
        doScale1(src, srcStartY, srcEndY, srcWidth,
                 dst, dstStartY, dstEndY, op);
}
 
template<std::unsigned_integral Pixel>
void RGBTriplet3xScaler<Pixel>::scale2x2to3x3(FrameSource& src,
        unsigned srcStartY, unsigned srcEndY, unsigned srcWidth,
        ScalerOutput<Pixel>& dst, unsigned dstStartY, unsigned dstEndY)
{
        PolyScale<Pixel, Scale_2on1<Pixel>> op(pixelOps);
        doScale2(src, srcStartY, srcEndY, srcWidth,
                 dst, dstStartY, dstEndY, op);
}
 
template<std::unsigned_integral Pixel>
void RGBTriplet3xScaler<Pixel>::scale8x1to9x3(FrameSource& src,
        unsigned srcStartY, unsigned srcEndY, unsigned srcWidth,
        ScalerOutput<Pixel>& dst, unsigned dstStartY, unsigned dstEndY)
{
        PolyScale<Pixel, Scale_8on3<Pixel>> op(pixelOps);
        doScale1(src, srcStartY, srcEndY, srcWidth,
                 dst, dstStartY, dstEndY, op);
}
 
template<std::unsigned_integral Pixel>
void RGBTriplet3xScaler<Pixel>::scale8x2to9x3(FrameSource& src,
        unsigned srcStartY, unsigned srcEndY, unsigned srcWidth,
        ScalerOutput<Pixel>& dst, unsigned dstStartY, unsigned dstEndY)
{
        PolyScale<Pixel, Scale_8on3<Pixel>> op(pixelOps);
        doScale2(src, srcStartY, srcEndY, srcWidth,
                 dst, dstStartY, dstEndY, op);
}
 
template<std::unsigned_integral Pixel>
void RGBTriplet3xScaler<Pixel>::scale4x1to3x3(FrameSource& src,
        unsigned srcStartY, unsigned srcEndY, unsigned srcWidth,
        ScalerOutput<Pixel>& dst, unsigned dstStartY, unsigned dstEndY)
{
        PolyScale<Pixel, Scale_4on1<Pixel>> op(pixelOps);
        doScale1(src, srcStartY, srcEndY, srcWidth,
                 dst, dstStartY, dstEndY, op);
}
 
template<std::unsigned_integral Pixel>
void RGBTriplet3xScaler<Pixel>::scale4x2to3x3(FrameSource& src,
        unsigned srcStartY, unsigned srcEndY, unsigned srcWidth,
        ScalerOutput<Pixel>& dst, unsigned dstStartY, unsigned dstEndY)
{
        PolyScale<Pixel, Scale_4on1<Pixel>> op(pixelOps);
        doScale2(src, srcStartY, srcEndY, srcWidth,
                 dst, dstStartY, dstEndY, op);
}
 
template<std::unsigned_integral Pixel>
static constexpr void fillLoop(std::span<Pixel, 9> in, std::span<Pixel> out)
{
        size_t outSize = out.size();
        assert(outSize >= 6);
        assert((outSize % 3) == 0);
 
        out[0] = in[0];
        out[1] = in[1];
        out[2] = in[2];
        auto in3 = in[3];
        auto in4 = in[4];
        auto in5 = in[5];
        for (unsigned x = 3; x < (outSize - 3); x += 3) {
                out[x + 0] = in3;
                out[x + 1] = in4;
                out[x + 2] = in5;
        }
        out[outSize - 3] = in[6];
        out[outSize - 2] = in[7];
        out[outSize - 1] = in[8];
}
 
template<std::unsigned_integral Pixel>
void RGBTriplet3xScaler<Pixel>::scaleBlank1to3(
                FrameSource& src, unsigned srcStartY, unsigned srcEndY,
                ScalerOutput<Pixel>& dst, unsigned dstStartY, unsigned dstEndY)
{
        auto [c1, c2] = calcBlur();
        int scanlineFactor = settings.getScanlineFactor();
 
        unsigned dstHeight = dst.getHeight();
        unsigned stopDstY = (dstEndY == dstHeight)
                          ? dstEndY : dstEndY - 3;
        unsigned srcY = srcStartY, dstY = dstStartY;
        for (/* */; dstY < stopDstY; srcY += 1, dstY += 3) {
                auto color = src.getLineColor<Pixel>(srcY);
 
                std::array<Pixel, 3>     inNormal;
                std::array<Pixel, 3 * 3> outNormal;
                std::array<Pixel, 3 * 3> outScanline;
                inNormal[0] = inNormal[1] = inNormal[2] = color;
                rgbify(inNormal, outNormal, c1, c2);
                for (auto [i, out] : enumerate(outScanline)) {
                        out = scanline.darken(outNormal[i], scanlineFactor);
                }
 
                auto dstLine0 = dst.acquireLine(dstY + 0);
                fillLoop(std::span{outNormal}, dstLine0);
                dst.releaseLine(dstY + 0, dstLine0);
 
                auto dstLine1 = dst.acquireLine(dstY + 1);
                fillLoop(std::span{outNormal}, dstLine1);
                dst.releaseLine(dstY + 1, dstLine1);
 
                auto dstLine2 = dst.acquireLine(dstY + 2);
                fillLoop(std::span{outScanline}, dstLine2);
                dst.releaseLine(dstY + 2, dstLine2);
        }
        if (dstY != dstHeight) {
                unsigned nextLineWidth = src.getLineWidth(srcY + 1);
                assert(src.getLineWidth(srcY) == 1);
                assert(nextLineWidth != 1);
                this->dispatchScale(src, srcY, srcEndY, nextLineWidth,
                                    dst, dstY, dstEndY);
        }
}
 
template<std::unsigned_integral Pixel>
void RGBTriplet3xScaler<Pixel>::scaleBlank2to3(
                FrameSource& src, unsigned srcStartY, unsigned /*srcEndY*/,
                ScalerOutput<Pixel>& dst, unsigned dstStartY, unsigned dstEndY)
{
        auto [c1, c2] = calcBlur();
        int scanlineFactor = settings.getScanlineFactor();
        for (unsigned srcY = srcStartY, dstY = dstStartY;
             dstY < dstEndY; srcY += 2, dstY += 3) {
                auto color0 = src.getLineColor<Pixel>(srcY + 0);
                auto color1 = src.getLineColor<Pixel>(srcY + 1);
 
                std::array<Pixel, 3> inNormal;
                std::array<Pixel, 3 * 3> out0Normal;
                std::array<Pixel, 3 * 3> out1Normal;
                std::array<Pixel, 3 * 3> outScanline;
 
                inNormal[0] = inNormal[1] = inNormal[2] = color0;
                rgbify(inNormal, out0Normal, c1, c2);
                inNormal[0] = inNormal[1] = inNormal[2] = color1;
                rgbify(inNormal, out1Normal, c1, c2);
 
                for (auto [i, out] : enumerate(outScanline)) {
                        out = scanline.darken(
                                out0Normal[i], out1Normal[i],
                                scanlineFactor);
                }
 
                auto dstLine0 = dst.acquireLine(dstY + 0);
                fillLoop(std::span{out0Normal}, dstLine0);
                dst.releaseLine(dstY + 0, dstLine0);
 
                auto dstLine1 = dst.acquireLine(dstY + 1);
                fillLoop(std::span{outScanline}, dstLine1);
                dst.releaseLine(dstY + 1, dstLine1);
 
                auto dstLine2 = dst.acquireLine(dstY + 2);
                fillLoop(std::span{out1Normal}, dstLine2);
                dst.releaseLine(dstY + 2, dstLine2);
        }
}
 
template<std::unsigned_integral Pixel>
void RGBTriplet3xScaler<Pixel>::scaleImage(FrameSource& src, const RawFrame* superImpose,
        unsigned srcStartY, unsigned srcEndY, unsigned srcWidth,
        ScalerOutput<Pixel>& dst, unsigned dstStartY, unsigned dstEndY)
{
        if (superImpose) {
                SuperImposedVideoFrame<Pixel> sf(src, *superImpose, pixelOps);
                srcWidth = sf.getLineWidth(srcStartY);
                this->dispatchScale(sf,  srcStartY, srcEndY, srcWidth,
                                    dst, dstStartY, dstEndY);
        } else {
                this->dispatchScale(src, srcStartY, srcEndY, srcWidth,
                                    dst, dstStartY, dstEndY);
        }
}
 
// Force template instantiation.
#if HAVE_16BPP
template class RGBTriplet3xScaler<uint16_t>;
#endif
#if HAVE_32BPP
template class RGBTriplet3xScaler<uint32_t>;
#endif
 
} // namespace openmsx