initial commit, 4.5 stable

thirdparty/msdfgen/core/ShapeDistanceFinder.hpp

@@ -0,0 +1,60 @@
+
+#include "ShapeDistanceFinder.h"
+
+namespace msdfgen {
+
+template <class ContourCombiner>
+ShapeDistanceFinder<ContourCombiner>::ShapeDistanceFinder(const Shape &shape) : shape(shape), contourCombiner(shape), shapeEdgeCache(shape.edgeCount()) { }
+
+template <class ContourCombiner>
+typename ShapeDistanceFinder<ContourCombiner>::DistanceType ShapeDistanceFinder<ContourCombiner>::distance(const Point2 &origin) {
+    contourCombiner.reset(origin);
+#ifdef MSDFGEN_USE_CPP11
+    typename ContourCombiner::EdgeSelectorType::EdgeCache *edgeCache = shapeEdgeCache.data();
+#else
+    typename ContourCombiner::EdgeSelectorType::EdgeCache *edgeCache = shapeEdgeCache.empty() ? NULL : &shapeEdgeCache[0];
+#endif
+
+    for (std::vector<Contour>::const_iterator contour = shape.contours.begin(); contour != shape.contours.end(); ++contour) {
+        if (!contour->edges.empty()) {
+            typename ContourCombiner::EdgeSelectorType &edgeSelector = contourCombiner.edgeSelector(int(contour-shape.contours.begin()));
+
+            const EdgeSegment *prevEdge = contour->edges.size() >= 2 ? *(contour->edges.end()-2) : *contour->edges.begin();
+            const EdgeSegment *curEdge = contour->edges.back();
+            for (std::vector<EdgeHolder>::const_iterator edge = contour->edges.begin(); edge != contour->edges.end(); ++edge) {
+                const EdgeSegment *nextEdge = *edge;
+                edgeSelector.addEdge(*edgeCache++, prevEdge, curEdge, nextEdge);
+                prevEdge = curEdge;
+                curEdge = nextEdge;
+            }
+        }
+    }
+
+    return contourCombiner.distance();
+}
+
+template <class ContourCombiner>
+typename ShapeDistanceFinder<ContourCombiner>::DistanceType ShapeDistanceFinder<ContourCombiner>::oneShotDistance(const Shape &shape, const Point2 &origin) {
+    ContourCombiner contourCombiner(shape);
+    contourCombiner.reset(origin);
+
+    for (std::vector<Contour>::const_iterator contour = shape.contours.begin(); contour != shape.contours.end(); ++contour) {
+        if (!contour->edges.empty()) {
+            typename ContourCombiner::EdgeSelectorType &edgeSelector = contourCombiner.edgeSelector(int(contour-shape.contours.begin()));
+
+            const EdgeSegment *prevEdge = contour->edges.size() >= 2 ? *(contour->edges.end()-2) : *contour->edges.begin();
+            const EdgeSegment *curEdge = contour->edges.back();
+            for (std::vector<EdgeHolder>::const_iterator edge = contour->edges.begin(); edge != contour->edges.end(); ++edge) {
+                const EdgeSegment *nextEdge = *edge;
+                typename ContourCombiner::EdgeSelectorType::EdgeCache dummy;
+                edgeSelector.addEdge(dummy, prevEdge, curEdge, nextEdge);
+                prevEdge = curEdge;
+                curEdge = nextEdge;
+            }
+        }
+    }
+
+    return contourCombiner.distance();
+}
+
+}