Ported Surface->offset() to XS

xs/xsp/Surface.xsp

@@ -80,6 +80,17 @@ Surface::polygons()
     OUTPUT:
         RETVAL
 
+Surfaces
+Surface::offset(delta, scale = CLIPPER_OFFSET_SCALE, joinType = ClipperLib::jtMiter, miterLimit = 3)
+    const float             delta
+    double                  scale
+    ClipperLib::JoinType    joinType
+    double                  miterLimit
+    CODE:
+        offset(*THIS, RETVAL, delta, scale, joinType, miterLimit);
+    OUTPUT:
+        RETVAL
+
 %}
 };
 

xs/xsp/my.map

@@ -24,6 +24,7 @@ Lines           T_ARRAYREF
 Polygons        T_ARRAYREF
 Polylines       T_ARRAYREF
 ExPolygons      T_ARRAYREF
+Surfaces        T_ARRAYREF
 
 # we return these types whenever we want the items to be returned
 # by reference and marked ::Ref because they're contained in another

xs/xsp/typemap.xspt

@@ -19,6 +19,7 @@
 %typemap{Polygons};
 %typemap{Polylines};
 %typemap{ExPolygons};
+%typemap{Surfaces};
 %typemap{Polygons*};
 %typemap{TriangleMeshPtrs};