Use Get*Box instead Get*Region if you are asking about position and size. And it is enough to have it in base class only.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@30874 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/dc.h

@@ -183,11 +183,6 @@ protected:
     virtual void DoSetClippingRegionAsRegion(const wxRegion& region);
     virtual void DoSetClippingRegion(wxCoord x, wxCoord y,
                                      wxCoord width, wxCoord height);
-    virtual void DoGetClippingRegion(wxCoord *x, wxCoord *y,
-                                     wxCoord *width, wxCoord *height)
-    {
-        GetClippingBox(x, y, width, height);
-    }
     virtual void DoGetClippingBox(wxCoord *x, wxCoord *y,
                                   wxCoord *w, wxCoord *h) const;