Separate into class files

src/libslic3r/NSVGUtils.hpp

@@ -0,0 +1,30 @@
+#ifndef slic3r_NSVGUtils_hpp_
+#define slic3r_NSVGUtils_hpp_
+
+#include "Polygon.hpp"
+#include "ExPolygon.hpp"
+#include "nanosvg/nanosvg.h"    // load SVG file
+
+namespace Slic3r {
+
+// Helper function to work with nano svg
+class NSVGUtils
+{
+public:
+    NSVGUtils() = delete;
+
+    // inspired by nanosvgrast.h function nsvgRasterize->nsvg__flattenShape
+    static void flatten_cubic_bez(Polygon &polygon,
+                                  float    tessTol,
+                                  Vec2f    p1,
+                                  Vec2f    p2,
+                                  Vec2f    p3,
+                                  Vec2f    p4,
+                                  int      level);
+    // convert svg image to ExPolygons
+    static ExPolygons to_ExPolygons(NSVGimage *image,
+                                    float      tessTol   = 10.,
+                                    int        max_level = 10);
+};
+} // namespace Slic3r
+#endif // slic3r_NSVGUtils_hpp_