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27 
28 #ifndef _VCLCANVAS_OUTDEVPROVIDER_HXX
29 #define _VCLCANVAS_OUTDEVPROVIDER_HXX
30 
31 #include <sal/types.h>
32 #include <boost/shared_ptr.hpp>
33 
34 
35 class OutputDevice;
36 
37 namespace vclcanvas
38 {
39 	/* Definition of OutDevProvider interface */
40 
41     /** Implementers of this interface provide the CanvasHelper
42         with its OutputDevice.
43 
44         This additional level of indirection was necessary, as the
45         OutputDevice is not an interface. There had to be a mechanism
46         to detect the moment when an OutputDevice is rendered to
47         (e.g. for the BitmapBackBuffer).
48      */
49     class OutDevProvider
50     {
51     public:
52         virtual ~OutDevProvider() {}
53 
54         virtual OutputDevice& 		getOutDev() = 0;
55         virtual const OutputDevice& getOutDev() const = 0;
56     };
57 
58     typedef ::boost::shared_ptr< OutDevProvider > OutDevProviderSharedPtr;
59 }
60 
61 #endif /* _VCLCANVAS_OUTDEVPROVIDER_HXX */
62