initial commit, 4.5 stable

thirdparty/msdfgen/core/ShapeDistanceFinder.h

@@ -0,0 +1,37 @@
+
+#pragma once
+
+#include <vector>
+#include "Vector2.hpp"
+#include "edge-selectors.h"
+#include "contour-combiners.h"
+
+namespace msdfgen {
+
+/// Finds the distance between a point and a Shape. ContourCombiner dictates the distance metric and its data type.
+template <class ContourCombiner>
+class ShapeDistanceFinder {
+
+public:
+    typedef typename ContourCombiner::DistanceType DistanceType;
+
+    // Passed shape object must persist until the distance finder is destroyed!
+    explicit ShapeDistanceFinder(const Shape &shape);
+    /// Finds the distance from origin. Not thread-safe! Is fastest when subsequent queries are close together.
+    DistanceType distance(const Point2 &origin);
+
+    /// Finds the distance between shape and origin. Does not allocate result cache used to optimize performance of multiple queries.
+    static DistanceType oneShotDistance(const Shape &shape, const Point2 &origin);
+
+private:
+    const Shape &shape;
+    ContourCombiner contourCombiner;
+    std::vector<typename ContourCombiner::EdgeSelectorType::EdgeCache> shapeEdgeCache;
+
+};
+
+typedef ShapeDistanceFinder<SimpleContourCombiner<TrueDistanceSelector> > SimpleTrueShapeDistanceFinder;
+
+}
+
+#include "ShapeDistanceFinder.hpp"