/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
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#ifndef INCLUDED_CANVAS_SOURCE_VCL_OUTDEVPROVIDER_HXX
#define INCLUDED_CANVAS_SOURCE_VCL_OUTDEVPROVIDER_HXX

#include <memory>

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 std::shared_ptr< OutDevProvider > OutDevProviderSharedPtr;
}

#endif // INCLUDED_CANVAS_SOURCE_VCL_OUTDEVPROVIDER_HXX

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