Adapt for new DC code

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@49864 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/graphicc.cpp

@@ -1036,8 +1036,13 @@ wxCairoContext::wxCairoContext( wxGraphicsRenderer* renderer, const wxWindowDC&
 : wxGraphicsContext(renderer)
 {
 #ifdef __WXGTK__
+#if wxUSE_NEW_DC
+    wxGTKImplDC *impldc = (wxGTKImplDC*) dc.GetImpl();
+    Init( gdk_cairo_create( impldc->GetGDKWindow() ) );
+#else  
     Init( gdk_cairo_create( dc.m_window ) );
 #endif
+#endif
 #ifdef __WXMAC__
     int width, height;
     dc.GetSize( &width, &height );