adding measuring contexts, streamlining printing code

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@43012 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/graphics.h

@@ -393,6 +393,9 @@ public:
 
     static wxGraphicsContext* Create( wxWindow* window ) ;
 
+    // create a context that can be used for measuring texts only, no drawing allowed
+    static wxGraphicsContext * Create();
+
     wxGraphicsPath CreatePath() const;
     
     virtual wxGraphicsPen CreatePen(const wxPen& pen) const;
@@ -605,6 +608,9 @@ public :
 
     virtual wxGraphicsContext * CreateContext( wxWindow* window ) = 0;
 
+    // create a context that can be used for measuring texts only, no drawing allowed
+    virtual wxGraphicsContext * CreateMeasuringContext() = 0;
+
     // Path
     
     virtual wxGraphicsPath CreatePath() = 0;