78 lines
3.1 KiB
C++
78 lines
3.1 KiB
C++
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#include "resolve-shape-geometry.h"
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#ifdef MSDFGEN_USE_SKIA
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#include <skia/core/SkPath.h>
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#include <skia/pathops/SkPathOps.h>
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#include "../core/Vector2.h"
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#include "../core/edge-segments.h"
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#include "../core/Contour.h"
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namespace msdfgen {
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SkPoint pointToSkiaPoint(Point2 p) {
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return SkPoint::Make((SkScalar) p.x, (SkScalar) p.y);
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}
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Point2 pointFromSkiaPoint(const SkPoint p) {
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return Point2((double) p.x(), (double) p.y());
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}
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void shapeToSkiaPath(SkPath &skPath, const Shape &shape) {
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for (std::vector<Contour>::const_iterator contour = shape.contours.begin(); contour != shape.contours.end(); ++contour) {
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if (!contour->edges.empty()) {
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skPath.moveTo(pointToSkiaPoint(contour->edges.front()->point(0)));
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for (std::vector<EdgeHolder>::const_iterator edge = contour->edges.begin(); edge != contour->edges.end(); ++edge) {
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if (const LinearSegment *linearSegment = dynamic_cast<const LinearSegment *>(&**edge))
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skPath.lineTo(pointToSkiaPoint(linearSegment->p[1]));
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else if (const QuadraticSegment *quadraticSegment = dynamic_cast<const QuadraticSegment *>(&**edge))
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skPath.quadTo(pointToSkiaPoint(quadraticSegment->p[1]), pointToSkiaPoint(quadraticSegment->p[2]));
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else if (const CubicSegment *cubicSegment = dynamic_cast<const CubicSegment *>(&**edge))
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skPath.cubicTo(pointToSkiaPoint(cubicSegment->p[1]), pointToSkiaPoint(cubicSegment->p[2]), pointToSkiaPoint(cubicSegment->p[3]));
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}
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}
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}
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}
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void shapeFromSkiaPath(Shape &shape, const SkPath &skPath) {
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shape.contours.clear();
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Contour *contour = &shape.addContour();
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SkPath::Iter pathIterator(skPath, true);
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SkPoint edgePoints[4];
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for (SkPath::Verb op; (op = pathIterator.next(edgePoints)) != SkPath::kDone_Verb;) {
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switch (op) {
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case SkPath::kMove_Verb:
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if (!contour->edges.empty())
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contour = &shape.addContour();
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break;
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case SkPath::kLine_Verb:
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contour->addEdge(new LinearSegment(pointFromSkiaPoint(edgePoints[0]), pointFromSkiaPoint(edgePoints[1])));
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break;
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case SkPath::kQuad_Verb:
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contour->addEdge(new QuadraticSegment(pointFromSkiaPoint(edgePoints[0]), pointFromSkiaPoint(edgePoints[1]), pointFromSkiaPoint(edgePoints[2])));
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break;
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case SkPath::kCubic_Verb:
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contour->addEdge(new CubicSegment(pointFromSkiaPoint(edgePoints[0]), pointFromSkiaPoint(edgePoints[1]), pointFromSkiaPoint(edgePoints[2]), pointFromSkiaPoint(edgePoints[3])));
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break;
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default:;
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}
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}
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if (contour->edges.empty())
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shape.contours.pop_back();
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}
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bool resolveShapeGeometry(Shape &shape) {
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SkPath skPath;
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shapeToSkiaPath(skPath, shape);
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if (!Simplify(skPath, &skPath))
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return false;
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// Skia's AsWinding doesn't seem to work for unknown reasons
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shapeFromSkiaPath(shape, skPath);
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shape.orientContours();
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return true;
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}
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}
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#endif
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