1 files changed, 12 insertions, 1 deletions
diff --git a/libs/canvas/canvas/polygon.h b/libs/canvas/canvas/polygon.h
index addfe48100..917122a9a2 100644
--- a/libs/canvas/canvas/polygon.h
+++ b/libs/canvas/canvas/polygon.h
@@ -20,18 +20,29 @@
 #ifndef __CANVAS_POLYGON_H__
 #define __CANVAS_POLYGON_H__
 
+#include "canvas/visibility.h"
 #include "canvas/poly_item.h"
 #include "canvas/outline.h"
 #include "canvas/fill.h"
 
 namespace ArdourCanvas {
 
-class Polygon : public PolyItem, public Fill
+class LIBCANVAS_API Polygon : public PolyItem, public Fill
 {
 public:
 	Polygon (Group *);
+        virtual ~Polygon();
 
 	void render (Rect const & area, Cairo::RefPtr<Cairo::Context>) const;
+	void compute_bounding_box () const;
+        bool covers (Duple const &) const;
+
+  protected:
+    mutable float* multiple;
+    mutable float* constant;
+    mutable Points::size_type cached_size;
+    
+    void cache_shape_computation () const;
 };
 	
 }