HQ2xLiteScaler.cc

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/*
 * Lightweight version of the hq2x scaler (http://www.hiend3d.com/hq2x.html)
 *
 * The difference between this version and the full version of hq2x is the
 * calculation of the distance between two colors. Here it's simplified to
 * just  color1 == color2
 * Because of this simplification a lot of the interpolation code can also
 * be simplified.
 * For low color images the result is very close to the full hq2x image but
 * it is calculated _a_lot_ faster.
 */
 
#include "HQ2xLiteScaler.hh"
#include "HQCommon.hh"
#include "LineScalers.hh"
#include "unreachable.hh"
#include "build-info.hh"
#include <cstdint>
 
namespace openmsx {
 
template<std::unsigned_integral Pixel> struct HQLite_1x1on2x2
{
        void operator()(std::span<const Pixel> in0, std::span<const Pixel> in1, std::span<const Pixel> in2,
                        std::span<Pixel> out0, std::span<Pixel> out1,
                        std::span<uint16_t> edgeBuf, EdgeHQLite edgeOp) __restrict;
};
 
template<std::unsigned_integral Pixel> struct HQLite_1x1on1x2
{
        void operator()(std::span<const Pixel> in0, std::span<const Pixel> in1, std::span<const Pixel> in2,
                        std::span<Pixel> out0, std::span<Pixel> out1,
                        std::span<uint16_t> edgeBuf, EdgeHQLite edgeOp) __restrict;
};
 
template<std::unsigned_integral Pixel>
void HQLite_1x1on2x2<Pixel>::operator()(
        std::span<const Pixel> in0, std::span<const Pixel> in1, std::span<const Pixel> in2,
        std::span<Pixel> out0, std::span<Pixel> out1,
        std::span<uint16_t> edgeBuf,
        EdgeHQLite /*edgeOp*/) __restrict
{
        auto srcWidth = edgeBuf.size();
        assert(in0.size() == srcWidth);
        assert(in1.size() == srcWidth);
        assert(in2.size() == srcWidth);
        assert(out0.size() == 2 * srcWidth);
        assert(out1.size() == 2 * srcWidth);
 
        auto c2 = readPixel(in0[0]);
        auto c5 = readPixel(in1[0]); auto c6 = c5;
        auto c8 = readPixel(in2[0]); auto c9 = c8;
 
        unsigned pattern = 0;
        if (c5 != c8) pattern |= 3 <<  6;
        if (c5 != c2) pattern |= 3 <<  9;
 
        for (auto x : xrange(srcWidth)) {
                auto c4 = c5;
                c5 = c6;
                c8 = c9;
                if (x != srcWidth - 1) {
                        c6 = readPixel(in1[x + 1]);
                        c9 = readPixel(in2[x + 1]);
                }
 
                pattern = (pattern >> 6) & 0x001F; // left overlap
                // overlaps with left
                //if (c8 != c4) pattern |= 1 <<  0; // B - l: c5-c9 6
                //if (c5 != c7) pattern |= 1 <<  1; // B - l: c6-c8 7
                //if (c5 != c4) pattern |= 1 <<  2; //     l: c5-c6 8
                // overlaps with top and left
                //if (c5 != c1) pattern |= 1 <<  3; //     l: c2-c6 9,  t: c4-c8 0
                //if (c4 != c2) pattern |= 1 <<  4; //     l: c5-c3 10, t: c5-c7 1
                // non-overlapping pixels
                if (c5 != c8) pattern |= 1 <<  5; // B
                if (c5 != c9) pattern |= 1 <<  6; // BR
                if (c6 != c8) pattern |= 1 <<  7; // BR
                if (c5 != c6) pattern |= 1 <<  8; // R
                // overlaps with top
                //if (c2 != c6) pattern |= 1 <<  9; // R - t: c5-c9 6
                //if (c5 != c3) pattern |= 1 << 10; // R - t: c6-c8 7
                //if (c5 != c2) pattern |= 1 << 11; //     t: c5-c8 5
                pattern |= ((edgeBuf[x] &  (1 << 5)            ) << 6) |
                           ((edgeBuf[x] & ((1 << 6) | (1 << 7))) << 3);
                edgeBuf[x] = narrow_cast<uint16_t>(pattern);
 
                unsigned pixel0, pixel1, pixel2, pixel3;
 
#include "HQ2xLiteScaler-1x1to2x2.nn"
 
                out0[2 * x + 0] = writePixel<Pixel>(pixel0);
                out0[2 * x + 1] = writePixel<Pixel>(pixel1);
                out1[2 * x + 0] = writePixel<Pixel>(pixel2);
                out1[2 * x + 1] = writePixel<Pixel>(pixel3);
        }
}
 
template<std::unsigned_integral Pixel>
void HQLite_1x1on1x2<Pixel>::operator()(
        std::span<const Pixel> in0, std::span<const Pixel> in1, std::span<const Pixel> in2,
        std::span<Pixel> out0, std::span<Pixel> out1,
        std::span<uint16_t> edgeBuf,
        EdgeHQLite /*edgeOp*/) __restrict
{
        //  +---+---+---+
        //  | 1 | 2 | 3 |
        //  +---+---+---+
        //  | 4 | 5 | 6 |
        //  +---+---+---+
        //  | 7 | 8 | 9 |
        //  +---+---+---+
        auto srcWidth = edgeBuf.size();
        assert(in0.size() == srcWidth);
        assert(in1.size() == srcWidth);
        assert(in2.size() == srcWidth);
        assert(out0.size() == srcWidth);
        assert(out1.size() == srcWidth);
 
        auto c2 = readPixel(in0[0]);
        auto c5 = readPixel(in1[0]); auto c6 = c5;
        auto c8 = readPixel(in2[0]); auto c9 = c8;
 
        unsigned pattern = 0;
        if (c5 != c8) pattern |= 3 <<  6;
        if (c5 != c2) pattern |= 3 <<  9;
 
        for (auto x : xrange(srcWidth)) {
                auto c4 = c5;
                c5 = c6;
                c8 = c9;
                if (x != srcWidth - 1) {
                        c6 = readPixel(in1[x + 1]);
                        c9 = readPixel(in2[x + 1]);
                }
 
                pattern = (pattern >> 6) & 0x001F; // left overlap
                // overlaps with left
                //if (c8 != c4) pattern |= 1 <<  0; // B - l: c5-c9 6
                //if (c5 != c7) pattern |= 1 <<  1; // B - l: c6-c8 7
                //if (c5 != c4) pattern |= 1 <<  2; //     l: c5-c6 8
                // overlaps with top and left
                //if (c5 != c1) pattern |= 1 <<  3; //     l: c2-c6 9,  t: c4-c8 0
                //if (c4 != c2) pattern |= 1 <<  4; //     l: c5-c3 10, t: c5-c7 1
                // non-overlapping pixels
                if (c5 != c8) pattern |= 1 <<  5; // B
                if (c5 != c9) pattern |= 1 <<  6; // BR
                if (c6 != c8) pattern |= 1 <<  7; // BR
                if (c5 != c6) pattern |= 1 <<  8; // R
                // overlaps with top
                //if (c2 != c6) pattern |= 1 <<  9; // R - t: c5-c9 6
                //if (c5 != c3) pattern |= 1 << 10; // R - t: c6-c8 7
                //if (c5 != c2) pattern |= 1 << 11; //     t: c5-c8 5
                pattern |= ((edgeBuf[x] &  (1 << 5)            ) << 6) |
                           ((edgeBuf[x] & ((1 << 6) | (1 << 7))) << 3);
                edgeBuf[x] = narrow_cast<uint16_t>(pattern);
 
                unsigned pixel0, pixel1;
 
#include "HQ2xLiteScaler-1x1to1x2.nn"
 
                out0[x] = writePixel<Pixel>(pixel0);
                out1[x] = writePixel<Pixel>(pixel1);
        }
}
 
 
 
template<std::unsigned_integral Pixel>
HQ2xLiteScaler<Pixel>::HQ2xLiteScaler(const PixelOperations<Pixel>& pixelOps_)
        : Scaler2<Pixel>(pixelOps_)
        , pixelOps(pixelOps_)
{
}
 
template<std::unsigned_integral Pixel>
void HQ2xLiteScaler<Pixel>::scale1x1to3x2(FrameSource& src,
        unsigned srcStartY, unsigned srcEndY, unsigned srcWidth,
        ScalerOutput<Pixel>& dst, unsigned dstStartY, unsigned dstEndY)
{
        PolyScale<Pixel, Scale_2on3<Pixel>> postScale(pixelOps);
        EdgeHQLite edgeOp;
        doHQScale2<Pixel>(HQLite_1x1on2x2<Pixel>(), edgeOp, postScale,
                          src, srcStartY, srcEndY, srcWidth,
                          dst, dstStartY, dstEndY);
}
 
template<std::unsigned_integral Pixel>
void HQ2xLiteScaler<Pixel>::scale1x1to2x2(FrameSource& src,
        unsigned srcStartY, unsigned srcEndY, unsigned srcWidth,
        ScalerOutput<Pixel>& dst, unsigned dstStartY, unsigned dstEndY)
{
        PolyScale<Pixel, Scale_1on1<Pixel>> postScale;
        EdgeHQLite edgeOp;
        doHQScale2<Pixel>(HQLite_1x1on2x2<Pixel>(), edgeOp, postScale,
                          src, srcStartY, srcEndY, srcWidth,
                          dst, dstStartY, dstEndY);
}
 
template<std::unsigned_integral Pixel>
void HQ2xLiteScaler<Pixel>::scale2x1to3x2(FrameSource& src,
        unsigned srcStartY, unsigned srcEndY, unsigned srcWidth,
        ScalerOutput<Pixel>& dst, unsigned dstStartY, unsigned dstEndY)
{
        PolyScale<Pixel, Scale_4on3<Pixel>> postScale(pixelOps);
        EdgeHQLite edgeOp;
        doHQScale2<Pixel>(HQLite_1x1on2x2<Pixel>(), edgeOp, postScale,
                          src, srcStartY, srcEndY, srcWidth,
                          dst, dstStartY, dstEndY);
}
 
template<std::unsigned_integral Pixel>
void HQ2xLiteScaler<Pixel>::scale1x1to1x2(FrameSource& src,
        unsigned srcStartY, unsigned srcEndY, unsigned srcWidth,
        ScalerOutput<Pixel>& dst, unsigned dstStartY, unsigned dstEndY)
{
        PolyScale<Pixel, Scale_1on1<Pixel>> postScale;
        EdgeHQLite edgeOp;
        doHQScale2<Pixel>(HQLite_1x1on1x2<Pixel>(), edgeOp, postScale,
                          src, srcStartY, srcEndY, srcWidth,
                          dst, dstStartY, dstEndY);
}
 
template<std::unsigned_integral Pixel>
void HQ2xLiteScaler<Pixel>::scale4x1to3x2(FrameSource& src,
        unsigned srcStartY, unsigned srcEndY, unsigned srcWidth,
        ScalerOutput<Pixel>& dst, unsigned dstStartY, unsigned dstEndY)
{
        PolyScale<Pixel, Scale_4on3<Pixel>> postScale(pixelOps);
        EdgeHQLite edgeOp;
        doHQScale2<Pixel>(HQLite_1x1on1x2<Pixel>(), edgeOp, postScale,
                          src, srcStartY, srcEndY, srcWidth,
                          dst, dstStartY, dstEndY);
}
 
template<std::unsigned_integral Pixel>
void HQ2xLiteScaler<Pixel>::scale2x1to1x2(FrameSource& src,
        unsigned srcStartY, unsigned srcEndY, unsigned srcWidth,
        ScalerOutput<Pixel>& dst, unsigned dstStartY, unsigned dstEndY)
{
        PolyScale<Pixel, Scale_2on1<Pixel>> postScale(pixelOps);
        EdgeHQLite edgeOp;
        doHQScale2<Pixel>(HQLite_1x1on1x2<Pixel>(), edgeOp, postScale,
                          src, srcStartY, srcEndY, srcWidth,
                          dst, dstStartY, dstEndY);
}
 
// Force template instantiation.
#if HAVE_16BPP
template class HQ2xLiteScaler<uint16_t>;
#endif
#if HAVE_32BPP
template class HQ2xLiteScaler<uint32_t>;
#endif
 
} // namespace openmsx