AOO410/main/cppcanvas/inc/cppcanvas/bitmapcanvas.hxx

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#ifndef _CPPCANVAS_BITMAPCANVAS_HXX
#define _CPPCANVAS_BITMAPCANVAS_HXX

#include <sal/types.h>
#include <osl/diagnose.h>

#include <boost/shared_ptr.hpp>
#include <basegfx/vector/b2isize.hxx>
#include <cppcanvas/canvas.hxx>


/* Definition of BitmapCanvas */

namespace cppcanvas
{
    class BitmapCanvas;

    // forward declaration, since cloneBitmapCanvas() also references BitmapCanvas
    typedef ::boost::shared_ptr< BitmapCanvas > BitmapCanvasSharedPtr;

    /** BitmapCanvas interface
     */
    class BitmapCanvas : public virtual Canvas
    {
    public:
        virtual ::basegfx::B2ISize 		getSize() const = 0;

        // shared_ptr does not allow for covariant return types
        BitmapCanvasSharedPtr			cloneBitmapCanvas() const
        {
            BitmapCanvasSharedPtr p( ::boost::dynamic_pointer_cast< BitmapCanvas >(this->clone()) );
            OSL_ENSURE(p.get(), "BitmapCanvas::cloneBitmapCanvas(): dynamic cast failed");
            return p;
        }
    };

}

#endif /* _CPPCANVAS_BITMAPCANVAS_HXX */