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#ifndef _DXCANVAS_CANVASHELPER_HXX_
#define _DXCANVAS_CANVASHELPER_HXX_

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

#include <basegfx/vector/b2isize.hxx>
#include <basegfx/vector/b2dsize.hxx>

#include "dx_graphicsprovider.hxx"
#include "dx_gdiplususer.hxx"
#include "dx_impltools.hxx"

#include <boost/utility.hpp>


namespace dxcanvas
{
    /** Helper class for basic canvas functionality. Also offers
        optional backbuffer painting, when providing it with a second
        HDC to render into.
     */
    class CanvasHelper : private ::boost::noncopyable
    {
    public:
        CanvasHelper();

        /// Release all references
        void disposing();

		/** Initialize canvas helper

        	This method late-initializes the canvas helper, providing
        	it with the necessary device and output objects. Note that
        	the CanvasHelper does <em>not</em> take ownership of the
        	passed rDevice reference, nor does it perform any
        	reference counting. Thus, to prevent the reference counted
        	SpriteCanvas object from deletion, the user of this class
        	is responsible for holding ref-counted references itself!

        	@param rDevice
            Reference device this canvas is associated with

         */
        void setDevice( com::sun::star::rendering::XGraphicDevice& rDevice );

        /** Set the target for rendering operations

            @param rTarget
            Render target
         */
        void setTarget( const GraphicsProviderSharedPtr& rTarget );

        /** Set the target for rendering operations

            @param rTarget
            Render target

            @param rOutputOffset
            Output offset in pixel
         */
        void setTarget( const GraphicsProviderSharedPtr& rTarget,
                        const ::basegfx::B2ISize& 		 rOutputOffset );


        // CanvasHelper functionality
        // ==========================

        // XCanvas (only providing, not implementing the
        // interface. Also note subtle method parameter differences)
        void clear();
        void drawPoint( const ::com::sun::star::rendering::XCanvas* 	pCanvas, 
                        const ::com::sun::star::geometry::RealPoint2D& 	aPoint, 
                        const ::com::sun::star::rendering::ViewState& 	viewState, 
                        const ::com::sun::star::rendering::RenderState& renderState );
        void drawLine( const ::com::sun::star::rendering::XCanvas* 		pCanvas,
                       const ::com::sun::star::geometry::RealPoint2D& 	aStartPoint,
                       const ::com::sun::star::geometry::RealPoint2D& 	aEndPoint,
                       const ::com::sun::star::rendering::ViewState& 	viewState,
                       const ::com::sun::star::rendering::RenderState& 	renderState	);
        void drawBezier( const ::com::sun::star::rendering::XCanvas* 			pCanvas,
                         const ::com::sun::star::geometry::RealBezierSegment2D&	aBezierSegment,
                         const ::com::sun::star::geometry::RealPoint2D& 		aEndPoint,
                         const ::com::sun::star::rendering::ViewState& 			viewState,
                         const ::com::sun::star::rendering::RenderState& 		renderState );
        ::com::sun::star::uno::Reference< ::com::sun::star::rendering::XCachedPrimitive >
        	drawPolyPolygon( const ::com::sun::star::rendering::XCanvas* 			pCanvas,
                             const ::com::sun::star::uno::Reference<
                             		::com::sun::star::rendering::XPolyPolygon2D >&	xPolyPolygon,
                             const ::com::sun::star::rendering::ViewState& 			viewState,
                             const ::com::sun::star::rendering::RenderState& 		renderState );
        ::com::sun::star::uno::Reference< ::com::sun::star::rendering::XCachedPrimitive >
        	strokePolyPolygon( const ::com::sun::star::rendering::XCanvas* 			pCanvas,
                               const ::com::sun::star::uno::Reference<
                               		::com::sun::star::rendering::XPolyPolygon2D >& 	xPolyPolygon,
                               const ::com::sun::star::rendering::ViewState& 		viewState,
                               const ::com::sun::star::rendering::RenderState& 		renderState,
                               const ::com::sun::star::rendering::StrokeAttributes& strokeAttributes );
        ::com::sun::star::uno::Reference< ::com::sun::star::rendering::XCachedPrimitive >
        	strokeTexturedPolyPolygon( const ::com::sun::star::rendering::XCanvas* 			pCanvas,
                                       const ::com::sun::star::uno::Reference<
                                       		::com::sun::star::rendering::XPolyPolygon2D >& 	xPolyPolygon,
                                       const ::com::sun::star::rendering::ViewState& 		viewState,
                                       const ::com::sun::star::rendering::RenderState& 		renderState,
                                       const ::com::sun::star::uno::Sequence<
                                       		::com::sun::star::rendering::Texture >& 		textures,
                                       const ::com::sun::star::rendering::StrokeAttributes& strokeAttributes );
        ::com::sun::star::uno::Reference< ::com::sun::star::rendering::XCachedPrimitive >
        	strokeTextureMappedPolyPolygon( const ::com::sun::star::rendering::XCanvas* 			pCanvas,
                                            const ::com::sun::star::uno::Reference<
                                            		::com::sun::star::rendering::XPolyPolygon2D >& 	xPolyPolygon,
                                            const ::com::sun::star::rendering::ViewState& 			viewState,
                                            const ::com::sun::star::rendering::RenderState& 		renderState,
                                            const ::com::sun::star::uno::Sequence<
                                            		::com::sun::star::rendering::Texture >& 		textures,
                                            const ::com::sun::star::uno::Reference<
                                            		::com::sun::star::geometry::XMapping2D >& 		xMapping,
                                            const ::com::sun::star::rendering::StrokeAttributes& 	strokeAttributes );
        ::com::sun::star::uno::Reference< ::com::sun::star::rendering::XPolyPolygon2D >
        	queryStrokeShapes( const ::com::sun::star::rendering::XCanvas* 			pCanvas,
                               const ::com::sun::star::uno::Reference<
                               		::com::sun::star::rendering::XPolyPolygon2D >& 	xPolyPolygon,
                               const ::com::sun::star::rendering::ViewState& 		viewState,
                               const ::com::sun::star::rendering::RenderState& 		renderState,
                               const ::com::sun::star::rendering::StrokeAttributes& strokeAttributes );
        ::com::sun::star::uno::Reference< ::com::sun::star::rendering::XCachedPrimitive >
        	fillPolyPolygon( const ::com::sun::star::rendering::XCanvas* 			pCanvas,
                             const ::com::sun::star::uno::Reference<
                             		::com::sun::star::rendering::XPolyPolygon2D >& 	xPolyPolygon,
                             const ::com::sun::star::rendering::ViewState& 			viewState,
                             const ::com::sun::star::rendering::RenderState& 		renderState );
        ::com::sun::star::uno::Reference< ::com::sun::star::rendering::XCachedPrimitive >
        	fillTexturedPolyPolygon( const ::com::sun::star::rendering::XCanvas* 			pCanvas,
                                     const ::com::sun::star::uno::Reference<
                                     		::com::sun::star::rendering::XPolyPolygon2D >& 	xPolyPolygon,
                                     const ::com::sun::star::rendering::ViewState& 			viewState,
                                     const ::com::sun::star::rendering::RenderState& 		renderState,
                                     const ::com::sun::star::uno::Sequence<
                                     		::com::sun::star::rendering::Texture >& 		textures );
        ::com::sun::star::uno::Reference< ::com::sun::star::rendering::XCachedPrimitive >
        	fillTextureMappedPolyPolygon( const ::com::sun::star::rendering::XCanvas* 			pCanvas,
                                          const ::com::sun::star::uno::Reference<
                                          		::com::sun::star::rendering::XPolyPolygon2D >& 	xPolyPolygon,
                                          const ::com::sun::star::rendering::ViewState& 		viewState,
                                          const ::com::sun::star::rendering::RenderState& 		renderState,
                                          const ::com::sun::star::uno::Sequence<
                                          		::com::sun::star::rendering::Texture >& 		textures,
                                          const ::com::sun::star::uno::Reference<
                                          		::com::sun::star::geometry::XMapping2D >& 		xMapping );

        ::com::sun::star::uno::Reference< ::com::sun::star::rendering::XCanvasFont > SAL_CALL
        	createFont( const ::com::sun::star::rendering::XCanvas* 			pCanvas,
                        const ::com::sun::star::rendering::FontRequest& 		fontRequest,
                        const ::com::sun::star::uno::Sequence<
                        		::com::sun::star::beans::PropertyValue >& 		extraFontProperties,
                        const ::com::sun::star::geometry::Matrix2D& 			fontMatrix );

        ::com::sun::star::uno::Sequence< ::com::sun::star::rendering::FontInfo >
        	queryAvailableFonts( const ::com::sun::star::rendering::XCanvas* 		pCanvas,
                                 const ::com::sun::star::rendering::FontInfo& 		aFilter,
                                 const ::com::sun::star::uno::Sequence<
                                 		::com::sun::star::beans::PropertyValue >& 	aFontProperties );

        ::com::sun::star::uno::Reference< ::com::sun::star::rendering::XCachedPrimitive >
        	drawText( const ::com::sun::star::rendering::XCanvas* 			pCanvas,
                      const ::com::sun::star::rendering::StringContext& 	text,
                      const ::com::sun::star::uno::Reference<
                      		::com::sun::star::rendering::XCanvasFont >& 	xFont,
                      const ::com::sun::star::rendering::ViewState& 		viewState,
                      const ::com::sun::star::rendering::RenderState& 		renderState,
                      sal_Int8 												textDirection );

        ::com::sun::star::uno::Reference< ::com::sun::star::rendering::XCachedPrimitive >
        	drawTextLayout( const ::com::sun::star::rendering::XCanvas* 	pCanvas,
                            const ::com::sun::star::uno::Reference<
                            	::com::sun::star::rendering::XTextLayout >& layoutetText,
                            const ::com::sun::star::rendering::ViewState& 	viewState,
                            const ::com::sun::star::rendering::RenderState& renderState );

        ::com::sun::star::uno::Reference< ::com::sun::star::rendering::XCachedPrimitive >
        	drawBitmap( const ::com::sun::star::rendering::XCanvas* 	pCanvas,
                        const ::com::sun::star::uno::Reference<
                        		::com::sun::star::rendering::XBitmap >& xBitmap,
                        const ::com::sun::star::rendering::ViewState& 	viewState,
                        const ::com::sun::star::rendering::RenderState& renderState );
        ::com::sun::star::uno::Reference< ::com::sun::star::rendering::XCachedPrimitive >
        	drawBitmapModulated( const ::com::sun::star::rendering::XCanvas* 		pCanvas,
                                 const ::com::sun::star::uno::Reference<
                                 		::com::sun::star::rendering::XBitmap >&		xBitmap,
                                 const ::com::sun::star::rendering::ViewState& 		viewState,
                                 const ::com::sun::star::rendering::RenderState& 	renderState );
        ::com::sun::star::uno::Reference< ::com::sun::star::rendering::XGraphicDevice >
        	getDevice();

        // Flush drawing queue to screen
        void					flush() const;

        /** Called from XCanvas base classes, to notify that content
            is _about_ to change
        */
        void modifying() {}

    protected:
        /// Refcounted global GDI+ state container
        GDIPlusUserSharedPtr			mpGdiPlusUser;

        /** Phyical output device

            Deliberately not a refcounted reference, because of
            potential circular references for spritecanvas.
         */
        com::sun::star::rendering::XGraphicDevice* mpDevice;

        /// Provides the Gdiplus::Graphics to render into
        GraphicsProviderSharedPtr                  mpGraphicsProvider;

        bool needOutput() const { return mpGraphicsProvider.get() != NULL; };

        // returns transparency of color
        void setupGraphicsState( GraphicsSharedPtr&                              rGraphics,
                                 const ::com::sun::star::rendering::ViewState& 	 viewState, 
                                 const ::com::sun::star::rendering::RenderState& renderState );

        Gdiplus::CompositingMode 	calcCompositingMode( sal_Int8 nMode );

        /// Current (transformation-independent) output buffer offset
        ::basegfx::B2ISize				maOutputOffset;
    };
}

#endif /* _DXCANVAS_CANVASHELPER_HXX_ */