xref: /aoo41x/main/cppcanvas/source/mtfrenderer/cachedprimitivebase.hxx (revision 2d788491)

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#ifndef _CPPCANVAS_CACHEDPRIMITIVEBASE_HXX
#define _CPPCANVAS_CACHEDPRIMITIVEBASE_HXX

#include <com/sun/star/uno/Reference.hxx>
#include <com/sun/star/rendering/XCanvas.hpp>

#include <cppcanvas/canvas.hxx>
#include <boost/utility.hpp>

#include "action.hxx"

namespace basegfx { class B2DHomMatrix; }


/* Definition of internal::CachedPrimitiveBase class */

namespace cppcanvas
{
    namespace internal
    {
        /** Base class providing cached re-rendering, if XCanvas
            returns XCachedPrimitive

            Derive from this class and implement private render()
            method to perform the actual primitive rendering. Return
            cached primitive into given reference. Next time this
            class' public render() method gets called, the cached
            representation is taken.
         */
        class CachedPrimitiveBase : public Action,
                                    private ::boost::noncopyable
        {
        public:
            /** Constructor

                @param rCanvas
                Canvas on which this primitive is to appear

                @param bOnlyRedrawWithSameTransform
                When true, this class only reuses the cached
                primitive, if the overall transformation stays the
                same. Otherwise, repaints are always performed via the
                cached primitive.
             */
            CachedPrimitiveBase( const CanvasSharedPtr& rCanvas,
                                 bool                   bOnlyRedrawWithSameTransform );
            virtual ~CachedPrimitiveBase() {}

            virtual bool render( const ::basegfx::B2DHomMatrix& rTransformation ) const;

        protected:
            using Action::render;

        private:
            virtual bool render( ::com::sun::star::uno::Reference<
                                     ::com::sun::star::rendering::XCachedPrimitive >& rCachedPrimitive,
                                 const ::basegfx::B2DHomMatrix&                       rTransformation ) const = 0;

            CanvasSharedPtr                                             mpCanvas;
            mutable ::com::sun::star::uno::Reference<
                    ::com::sun::star::rendering::XCachedPrimitive > 	mxCachedPrimitive;
            mutable ::basegfx::B2DHomMatrix                             maLastTransformation;
            const bool                                                  mbOnlyRedrawWithSameTransform;
        };
    }
}

#endif /*_CPPCANVAS_CACHEDPRIMITIVEBASE_HXX */