keeping the OSX specific use of origin for non-native borders

fixes #19108

include/wx/dcgraph.h

@@ -227,6 +227,10 @@ protected:
     // wxGraphicsContext, in the expectation that the derived class will do it
     wxGCDCImpl(wxDC* owner, int);
 
+#ifdef __WXOSX__
+    virtual wxPoint OSXGetOrigin() const { return wxPoint(); }
+#endif
+
     // scaling variables
     bool m_logicalFunctionSupported;
     wxGraphicsMatrix m_matrixOriginal;

include/wx/osx/dcclient.h

@@ -32,9 +32,12 @@ public:
     virtual wxBitmap DoGetAsBitmap(const wxRect *subrect) const wxOVERRIDE;
 
 protected:
+    virtual wxPoint OSXGetOrigin() const wxOVERRIDE;
+
     bool m_release;
     int m_width;
     int m_height;
+    wxPoint m_origin;
 
     wxDECLARE_CLASS(wxWindowDCImpl);
     wxDECLARE_NO_COPY_CLASS(wxWindowDCImpl);