Ported ExtrusionPath to XS. Failing test for Surface

xs/src/Polyline.hpp

@@ -9,6 +9,7 @@ extern "C" {
 }
 
 #include "Point.hpp"
+#include <algorithm>
 
 namespace Slic3r {
 
@@ -19,6 +20,7 @@ class Polyline
     void scale(double factor);
     void translate(double x, double y);
     void rotate(double angle, Point* center);
+    void reverse();
 };
 
 typedef std::vector<Polyline> Polylines;
@@ -49,6 +51,12 @@ Polyline::rotate(double angle, Point* center)
     }
 }
 
+void
+Polyline::reverse()
+{
+    std::reverse(this->points.begin(), this->points.end());
+}
+
 void
 perl2polyline(SV* poly_sv, Polyline& poly)
 {