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#ifndef _VCLCANVAS_OUTDEVPROVIDER_HXX
#define _VCLCANVAS_OUTDEVPROVIDER_HXX

#include <sal/types.h>
#include <boost/shared_ptr.hpp>


class OutputDevice;

namespace vclcanvas
{
	/* Definition of OutDevProvider interface */

    /** Implementers of this interface provide the CanvasHelper 
        with its OutputDevice.

        This additional level of indirection was necessary, as the
        OutputDevice is not an interface. There had to be a mechanism
        to detect the moment when an OutputDevice is rendered to
        (e.g. for the BitmapBackBuffer).
     */
    class OutDevProvider
    {
    public:
        virtual ~OutDevProvider() {}

        virtual OutputDevice& 		getOutDev() = 0;
        virtual const OutputDevice& getOutDev() const = 0;
    };

    typedef ::boost::shared_ptr< OutDevProvider > OutDevProviderSharedPtr;
}

#endif /* _VCLCANVAS_OUTDEVPROVIDER_HXX */