Add Text rendering

- Add FreeType as dependency
- Add MsdfGen as dependency
- Add MsdfAtlasGen as dependency

CopiumEngine/ext/include/msdfgen/core/contour-combiners.h

@@ -0,0 +1,47 @@
+
+#pragma once
+
+#include "Shape.h"
+#include "edge-selectors.h"
+
+namespace msdfgen {
+
+/// Simply selects the nearest contour.
+template <class EdgeSelector>
+class SimpleContourCombiner {
+
+public:
+    typedef EdgeSelector EdgeSelectorType;
+    typedef typename EdgeSelector::DistanceType DistanceType;
+
+    explicit SimpleContourCombiner(const Shape &shape);
+    void reset(const Point2 &p);
+    EdgeSelector & edgeSelector(int i);
+    DistanceType distance() const;
+
+private:
+    EdgeSelector shapeEdgeSelector;
+
+};
+
+/// Selects the nearest contour that actually forms a border between filled and unfilled area.
+template <class EdgeSelector>
+class OverlappingContourCombiner {
+
+public:
+    typedef EdgeSelector EdgeSelectorType;
+    typedef typename EdgeSelector::DistanceType DistanceType;
+
+    explicit OverlappingContourCombiner(const Shape &shape);
+    void reset(const Point2 &p);
+    EdgeSelector & edgeSelector(int i);
+    DistanceType distance() const;
+
+private:
+    Point2 p;
+    std::vector<int> windings;
+    std::vector<EdgeSelector> edgeSelectors;
+
+};
+
+}