provide GetSize() getters in wxBitmap and wxImage

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@57014 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/image.h

@@ -361,6 +361,9 @@ public:
     int GetWidth() const;
     int GetHeight() const;
 
+    wxSize GetSize() const
+        { return wxSize(GetWidth(), GetHeight()); }
+
     // Gets the type of image found by LoadFile or specified with SaveFile
     wxBitmapType GetType() const;