Added wxTLW::SetShape and implementations for wxGTK, wxMSW and an

empty stub for wxMac.
Added some generic helpers and a new ctor to wxRegion.
Added samples/shaped.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@19857 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/toplevel.h

@@ -108,6 +108,11 @@ public:
     virtual wxString GetTitle() const = 0;
      */
 
+    // Set the shape of the window to the given region.
+    // Returns TRUE if the platform supports this feature (and the
+    // operation is successful.)
+    virtual bool SetShape(const wxRegion& region) { return FALSE; }
+
     // old functions, use the new ones instead!
 #if WXWIN_COMPATIBILITY_2
     bool Iconized() const { return IsIconized(); }