115 lines
4.4 KiB
C++
115 lines
4.4 KiB
C++
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#include "rasterization.h"
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#include <vector>
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#include "arithmetics.hpp"
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namespace msdfgen {
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void rasterize(const BitmapRef<float, 1> &output, const Shape &shape, const Projection &projection, FillRule fillRule) {
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Scanline scanline;
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for (int y = 0; y < output.height; ++y) {
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int row = shape.inverseYAxis ? output.height-y-1 : y;
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shape.scanline(scanline, projection.unprojectY(y+.5));
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for (int x = 0; x < output.width; ++x)
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*output(x, row) = (float) scanline.filled(projection.unprojectX(x+.5), fillRule);
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}
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}
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void distanceSignCorrection(const BitmapRef<float, 1> &sdf, const Shape &shape, const Projection &projection, FillRule fillRule) {
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Scanline scanline;
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for (int y = 0; y < sdf.height; ++y) {
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int row = shape.inverseYAxis ? sdf.height-y-1 : y;
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shape.scanline(scanline, projection.unprojectY(y+.5));
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for (int x = 0; x < sdf.width; ++x) {
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bool fill = scanline.filled(projection.unprojectX(x+.5), fillRule);
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float &sd = *sdf(x, row);
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if ((sd > .5f) != fill)
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sd = 1.f-sd;
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}
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}
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}
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template <int N>
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static void multiDistanceSignCorrection(const BitmapRef<float, N> &sdf, const Shape &shape, const Projection &projection, FillRule fillRule) {
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int w = sdf.width, h = sdf.height;
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if (!(w*h))
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return;
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Scanline scanline;
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bool ambiguous = false;
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std::vector<char> matchMap;
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matchMap.resize(w*h);
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char *match = &matchMap[0];
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for (int y = 0; y < h; ++y) {
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int row = shape.inverseYAxis ? h-y-1 : y;
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shape.scanline(scanline, projection.unprojectY(y+.5));
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for (int x = 0; x < w; ++x) {
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bool fill = scanline.filled(projection.unprojectX(x+.5), fillRule);
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float *msd = sdf(x, row);
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float sd = median(msd[0], msd[1], msd[2]);
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if (sd == .5f)
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ambiguous = true;
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else if ((sd > .5f) != fill) {
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msd[0] = 1.f-msd[0];
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msd[1] = 1.f-msd[1];
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msd[2] = 1.f-msd[2];
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*match = -1;
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} else
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*match = 1;
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if (N >= 4 && (msd[3] > .5f) != fill)
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msd[3] = 1.f-msd[3];
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++match;
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}
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}
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// This step is necessary to avoid artifacts when whole shape is inverted
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if (ambiguous) {
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match = &matchMap[0];
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for (int y = 0; y < h; ++y) {
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int row = shape.inverseYAxis ? h-y-1 : y;
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for (int x = 0; x < w; ++x) {
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if (!*match) {
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int neighborMatch = 0;
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if (x > 0) neighborMatch += *(match-1);
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if (x < w-1) neighborMatch += *(match+1);
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if (y > 0) neighborMatch += *(match-w);
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if (y < h-1) neighborMatch += *(match+w);
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if (neighborMatch < 0) {
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float *msd = sdf(x, row);
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msd[0] = 1.f-msd[0];
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msd[1] = 1.f-msd[1];
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msd[2] = 1.f-msd[2];
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}
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}
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++match;
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}
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}
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}
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}
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void distanceSignCorrection(const BitmapRef<float, 3> &sdf, const Shape &shape, const Projection &projection, FillRule fillRule) {
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multiDistanceSignCorrection(sdf, shape, projection, fillRule);
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}
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void distanceSignCorrection(const BitmapRef<float, 4> &sdf, const Shape &shape, const Projection &projection, FillRule fillRule) {
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multiDistanceSignCorrection(sdf, shape, projection, fillRule);
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}
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// Legacy API
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void rasterize(const BitmapRef<float, 1> &output, const Shape &shape, const Vector2 &scale, const Vector2 &translate, FillRule fillRule) {
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rasterize(output, shape, Projection(scale, translate), fillRule);
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}
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void distanceSignCorrection(const BitmapRef<float, 1> &sdf, const Shape &shape, const Vector2 &scale, const Vector2 &translate, FillRule fillRule) {
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distanceSignCorrection(sdf, shape, Projection(scale, translate), fillRule);
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}
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void distanceSignCorrection(const BitmapRef<float, 3> &sdf, const Shape &shape, const Vector2 &scale, const Vector2 &translate, FillRule fillRule) {
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distanceSignCorrection(sdf, shape, Projection(scale, translate), fillRule);
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}
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void distanceSignCorrection(const BitmapRef<float, 4> &sdf, const Shape &shape, const Vector2 &scale, const Vector2 &translate, FillRule fillRule) {
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distanceSignCorrection(sdf, shape, Projection(scale, translate), fillRule);
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}
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}
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