AOO410/main/drawinglayer/inc/drawinglayer/primitive2d/baseprimitive2d.hxx - openoffice - Git at Google

 /**************************************************************
  *
  * Licensed to the Apache Software Foundation (ASF) under one
  * or more contributor license agreements.  See the NOTICE file
  * distributed with this work for additional information
  * regarding copyright ownership.  The ASF licenses this file
  * to you under the Apache License, Version 2.0 (the
  * "License"); you may not use this file except in compliance
  * with the License.  You may obtain a copy of the License at
  *
  *   http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing,
  * software distributed under the License is distributed on an
  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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  * specific language governing permissions and limitations
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 #ifndef INCLUDED_DRAWINGLAYER_PRIMITIVE2D_BASEPRIMITIVE2D_HXX
 #define INCLUDED_DRAWINGLAYER_PRIMITIVE2D_BASEPRIMITIVE2D_HXX

 #include <drawinglayer/drawinglayerdllapi.h>
 #include <cppuhelper/compbase1.hxx>
 #include <boost/utility.hpp>
 #include <com/sun/star/graphic/XPrimitive2D.hpp>
 #include <comphelper/broadcasthelper.hxx>
 #include <basegfx/range/b2drange.hxx>

 //////////////////////////////////////////////////////////////////////////////
 /** defines for DeclPrimitrive2DIDBlock and ImplPrimitrive2DIDBlock
     Added to be able to simply change identification stuff later, e.g. add
     a identification string and/or ID to the interface and to the implementation
     ATM used to delclare implement getPrimitive2DID()
 */

 #define DeclPrimitrive2DIDBlock() \
 	virtual sal_uInt32 getPrimitive2DID() const;

 #define ImplPrimitrive2DIDBlock(TheClass, TheID) \
 	sal_uInt32 TheClass::getPrimitive2DID() const { return TheID; }

 //////////////////////////////////////////////////////////////////////////////
 // predefines

 namespace drawinglayer { namespace geometry {
 	class ViewInformation2D;
 }}

 namespace drawinglayer { namespace primitive2d {
 	/// typedefs for basePrimitive2DImplBase, Primitive2DSequence and Primitive2DReference
 	typedef cppu::WeakComponentImplHelper1< ::com::sun::star::graphic::XPrimitive2D > BasePrimitive2DImplBase;
 	typedef ::com::sun::star::uno::Reference< ::com::sun::star::graphic::XPrimitive2D > Primitive2DReference;
 	typedef ::com::sun::star::uno::Sequence< Primitive2DReference > Primitive2DSequence;
 }}

 //////////////////////////////////////////////////////////////////////////////
 // basePrimitive2D class

 namespace drawinglayer
 {
 	namespace primitive2d
 	{
         /** BasePrimitive2D class

             Baseclass for all C++ implementations of com::sun::star::graphic::XPrimitive2D

             This class is strongly virtual due to the lack of getPrimitiveID() implementation.
             This is by purpose, this base class shall not be incarnated and be used directly as
             a XPrimitive2D.

             Is is derived from boost::noncopyable to make clear that a primitive is a read-only
             instance and copying or changing values is not intended. The idea is to hold all data
             needed for visualisation of this primitive in unchangeable form.

             It is derived from comphelper::OBaseMutex to have a Mutex at hand; in a base
             implementation this may not be needed, but e.g. when buffering at last decomposition
             in a local member, multiple threads may try to decompose at the same time, so locking
             is needed to avoid race conditions seen from the UNO object implementation.

             A method to get a simplified representation is provided by get2DDecomposition. The
             default implementation returns an empty sequence. The idea is that processors
             using this primitive and do not know it, may get the decomposition and process
             these instead. An example is e.g. a fat line, who's decomposition may contain
             the geometric representation of that line using filled polygon prmimitives. When
             the renderer knows how to handle fat lines, he may proccess this primitive directly;
             if not he can use the decomposition. With this functionality, renderers may operate by
             knowing only a small set of primitives.

             When a primitive does not implement get2DDecomposition, it is called a 'Basic Primitive' and
             belongs to the set of primitives which a processor should be able to handle. Practice
             will define this minimal sets of primitives. When defined and the concept is prooved,
             unique UNO APIs may be defined/implemented for these set to allow more intense work
             with primitives using UNO.

             Current Basic 2D Primitives are:

             - BitmapPrimitive2D (bitmap data, evtl. with transparence)
             - PointArrayPrimitive2D (single points)
             - PolygonHairlinePrimitive2D (hairline curves/polygons)
             - PolyPolygonColorPrimitive2D (colored polygons)

             UPDATE: MetafilePrimitive2D (VCL Metafile) is taken off this list since
             it is implemented with the integration of CWS aw078 into DV300m69.

             All other implemented primitives have a defined decomposition and can thus be
             decomposed down to this small set.

             A renderer implementing support for this minimal set of primitives can completely
             render primitive-based visualisations. Of course, he also has to take states into account
             which are representated by GroupPrimitive2D derivations, see groupprimitive2d.hxx

             To support getting the geometric BoundRect, getB2DRange is used. The default
             implementation will use the get2DDecomposition result and merge a range from the
             entries. Thus, an implementation is only necessary for the Basic Primitives, but
             of course speedups are possible (and are used) by implementing the method at higher-level
             primitives.

             For primitive identification, getPrimitiveID is used currently in this implementations
             to allow a fast switch/case processing. This needs a unique identifier mechanism which
             currently uses defines (see drawinglayer_primitivetypes2d.hxx). For UNO prmitive API
             it will be needed to add a unique descriptor (Name?) later to the API.

             This base implementation provides mappings from the methods from XPrimitive2D
             (getDecomposition/getRange) to the appropriate methods in the C++ implementations
             (get2DDecomposition/getB2DRange). The PropertyValue ViewParameters is converted to
             the appropriate C++ implementation class ViewInformation2D.

             This base class does not implement any buffering; e.g. buffering the decompositon
             and/or the range. These may be buffered anytime since the definition is that the primitive
             is read-only and thus unchangeable. This implies that the decomposition and/or getting
             the range will lead to the same result as last time, under the precondition that
             the parameter ViewInformation2D is the same as the last one. This is usually the case
             for view-independent primitives which are defined by not using ViewInformation2D
             in their get2DDecomposition/getB2DRange implementations.
          */
 		class DRAWINGLAYER_DLLPUBLIC BasePrimitive2D
 		:	private boost::noncopyable,
 			protected comphelper::OBaseMutex,
 			public BasePrimitive2DImplBase
 		{
 		private:
 		protected:
 		public:
 			// constructor/destructor
 			BasePrimitive2D();
             virtual ~BasePrimitive2D();

 			/** the ==operator is mainly needed to allow testing newly-created primitives against their last
 			    incarnation which buffers/holds the made decompositions. The default implementation
 			    uses getPrimitive2DID()-calls to test if it's the same ID at last. Overloaded implementation are then
 			    based on this implementation
              */
 			virtual bool operator==( const BasePrimitive2D& rPrimitive ) const;
 			bool operator!=( const BasePrimitive2D& rPrimitive ) const { return !operator==(rPrimitive); }

 			/// The default implementation will use getDecomposition results to create the range
 			virtual basegfx::B2DRange getB2DRange(const geometry::ViewInformation2D& rViewInformation) const;

 			/** provide unique ID for fast identifying of known primitive implementations in renderers. These use
 			    the the defines from primitivetypes2d.hxx to define unique IDs.
 			    This method is normally defined using DeclPrimitrive2DIDBlock()
              */
 			virtual sal_uInt32 getPrimitive2DID() const = 0;

 			/// The default implementation will return an empty sequence
 			virtual Primitive2DSequence get2DDecomposition(const geometry::ViewInformation2D& rViewInformation) const;

 			//
 			// Methods from XPrimitive2D
 			//

 			/** The getDecomposition implementation for UNO API will use getDecomposition from this implementation. It
 			    will construct a ViewInformation2D from the ViewParameters for that purpose
              */
 			virtual Primitive2DSequence SAL_CALL getDecomposition( const ::com::sun::star::uno::Sequence< ::com::sun::star::beans::PropertyValue >& rViewParameters ) throw ( ::com::sun::star::uno::RuntimeException );

 			/** The getRange implementation for UNO API will use getRange from this implementation. It
 			    will construct a ViewInformation2D from the ViewParameters for that purpose
              */
 			virtual ::com::sun::star::geometry::RealRectangle2D SAL_CALL getRange( const ::com::sun::star::uno::Sequence< ::com::sun::star::beans::PropertyValue >& rViewParameters ) throw ( ::com::sun::star::uno::RuntimeException );
 		};
 	} // end of namespace primitive2d
 } // end of namespace drawinglayer

 //////////////////////////////////////////////////////////////////////////////
 // BufferedDecompositionPrimitive2D class

 namespace drawinglayer
 {
 	namespace primitive2d
 	{
         /** BufferedDecompositionPrimitive2D class

             Baseclass for all C++ implementations of com::sun::star::graphic::XPrimitive2D
             which want to buffer the decomoposition result

             Buffering the decomposition is the most-used buffering and is thus used my most
             primitive implementations which support a decomposition as base class.

             The buffering is done by holding the last decomposition in the local parameter
             maBuffered2DDecomposition. The default implementation of get2DDecomposition checks
             if maBuffered2DDecomposition is empty. If yes, it uses create2DDecomposition
             to create the content. In all cases, maBuffered2DDecomposition is returned.

             For view-dependent primitives derived from Primitive2DBufferDecomposition more needs
             to be done when the decomposition depends on parts of the parameter ViewInformation2D.
             This defines a standard method for processing these:

             Implement a view-dependent get2DDecomposition doing te following steps:
             (a) Locally extract needed parameters from ViewInformation2D to new, local parameters
                 (this may be a complete local copy of ViewInformation2D)
             (b) If a buffered decomposition exists, ckeck if one of the new local parameters
                 differs from the corresponding locally remembered (as member) ones. If yes,
                 clear maBuffered2DDecomposition
             (d) call baseclass::get2DDecomposition which will use create2DDecomposition
                 to fill maBuffered2DDecomposition if it's empty
             (e) copy the new local parameters to the corresponding locally remembered ones
                 to identify if a new decomposition is needed at the next call
             (f) return maBuffered2DDecomposition
          */
 		class DRAWINGLAYER_DLLPUBLIC BufferedDecompositionPrimitive2D
 		:	public BasePrimitive2D
 		{
 		private:
 			/// a sequence used for buffering the last create2DDecomposition() result
 			Primitive2DSequence								maBuffered2DDecomposition;

 		protected:
 			/** access methods to maBuffered2DDecomposition. The usage of this methods may allow
 			    later thread-safe stuff to be added if needed. Only to be used by getDecomposition()
 			    implementations for buffering the last decomposition.
              */
 			const Primitive2DSequence& getBuffered2DDecomposition() const { return maBuffered2DDecomposition; }
 			void setBuffered2DDecomposition(const Primitive2DSequence& rNew) { maBuffered2DDecomposition = rNew; }

 			/** method which is to be used to implement the local decomposition of a 2D primitive. The default
 			    implementation will just return an empty decomposition
              */
 			virtual Primitive2DSequence create2DDecomposition(const geometry::ViewInformation2D& rViewInformation) const;

 		public:
 			// constructor/destructor
 			BufferedDecompositionPrimitive2D();

 			/** The getDecomposition default implementation will on demand use create2DDecomposition() if
                 maBuffered2DDecomposition is empty. It will set maBuffered2DDecomposition to this obtained decomposition
                 to buffer it. If the decomposition is also ViewInformation2D-dependent, this method needs to be
                 overloaded and the ViewInformation2D for the last decomposition need to be remembered, too, and
                 be used in the next call to decide if the buffered decomposition may be reused or not.
              */
 			virtual Primitive2DSequence get2DDecomposition(const geometry::ViewInformation2D& rViewInformation) const;
 		};
 	} // end of namespace primitive2d
 } // end of namespace drawinglayer

 //////////////////////////////////////////////////////////////////////////////
 // tooling

 namespace drawinglayer
 {
 	namespace primitive2d
 	{
         /// support to handle a sequence of primitives as stl vector and convert it during creation
 	    typedef ::std::vector< BasePrimitive2D* > Primitive2DVector;
         Primitive2DSequence DRAWINGLAYER_DLLPUBLIC Primitive2DVectorToPrimitive2DSequence(const Primitive2DVector& rSource, bool bInvert = false);

         /// get B2DRange from a given Primitive2DReference
 		basegfx::B2DRange DRAWINGLAYER_DLLPUBLIC getB2DRangeFromPrimitive2DReference(const Primitive2DReference& rCandidate, const geometry::ViewInformation2D& aViewInformation);

 		/// get B2DRange from a given Primitive2DSequence
 		basegfx::B2DRange DRAWINGLAYER_DLLPUBLIC getB2DRangeFromPrimitive2DSequence(const Primitive2DSequence& rCandidate, const geometry::ViewInformation2D& aViewInformation);

 		/** compare two Primitive2DReferences for equality, including trying to get implementations (BasePrimitive2D)
 		    and using compare operator
          */
 		bool DRAWINGLAYER_DLLPUBLIC arePrimitive2DReferencesEqual(const Primitive2DReference& rA, const Primitive2DReference& rB);

 		/// compare two Primitive2DReferences for equality, uses arePrimitive2DReferencesEqual internally
 		bool DRAWINGLAYER_DLLPUBLIC arePrimitive2DSequencesEqual(const Primitive2DSequence& rA, const Primitive2DSequence& rB);

 		/// concatenate sequence
 		void DRAWINGLAYER_DLLPUBLIC appendPrimitive2DSequenceToPrimitive2DSequence(Primitive2DSequence& rDest, const Primitive2DSequence& rSource);

 		/// concatenate single Primitive2D
 		void DRAWINGLAYER_DLLPUBLIC appendPrimitive2DReferenceToPrimitive2DSequence(Primitive2DSequence& rDest, const Primitive2DReference& rSource);

 	} // end of namespace primitive2d
 } // end of namespace drawinglayer

 //////////////////////////////////////////////////////////////////////////////

 #endif //INCLUDED_DRAWINGLAYER_PRIMITIVE2D_BASEPRIMITIVE2D_HXX

 //////////////////////////////////////////////////////////////////////////////
 // eof
	/**************************************************************
	*
	* Licensed to the Apache Software Foundation (ASF) under one
	* or more contributor license agreements. See the NOTICE file
	* distributed with this work for additional information
	* regarding copyright ownership. The ASF licenses this file
	* to you under the Apache License, Version 2.0 (the
	* "License"); you may not use this file except in compliance
	* with the License. You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing,
	* software distributed under the License is distributed on an
	* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
	* KIND, either express or implied. See the License for the
	* specific language governing permissions and limitations
	* under the License.
	*
	*************************************************************/



	#ifndef INCLUDED_DRAWINGLAYER_PRIMITIVE2D_BASEPRIMITIVE2D_HXX
	#define INCLUDED_DRAWINGLAYER_PRIMITIVE2D_BASEPRIMITIVE2D_HXX

	#include <drawinglayer/drawinglayerdllapi.h>
	#include <cppuhelper/compbase1.hxx>
	#include <boost/utility.hpp>
	#include <com/sun/star/graphic/XPrimitive2D.hpp>
	#include <comphelper/broadcasthelper.hxx>
	#include <basegfx/range/b2drange.hxx>

	//////////////////////////////////////////////////////////////////////////////
	/** defines for DeclPrimitrive2DIDBlock and ImplPrimitrive2DIDBlock
	Added to be able to simply change identification stuff later, e.g. add
	a identification string and/or ID to the interface and to the implementation
	ATM used to delclare implement getPrimitive2DID()
	*/

	#define DeclPrimitrive2DIDBlock() \
	virtual sal_uInt32 getPrimitive2DID() const;

	#define ImplPrimitrive2DIDBlock(TheClass, TheID) \
	sal_uInt32 TheClass::getPrimitive2DID() const { return TheID; }

	//////////////////////////////////////////////////////////////////////////////
	// predefines

	namespace drawinglayer { namespace geometry {
	class ViewInformation2D;
	}}

	namespace drawinglayer { namespace primitive2d {
	/// typedefs for basePrimitive2DImplBase, Primitive2DSequence and Primitive2DReference
	typedef cppu::WeakComponentImplHelper1< ::com::sun::star::graphic::XPrimitive2D > BasePrimitive2DImplBase;
	typedef ::com::sun::star::uno::Reference< ::com::sun::star::graphic::XPrimitive2D > Primitive2DReference;
	typedef ::com::sun::star::uno::Sequence< Primitive2DReference > Primitive2DSequence;
	}}

	//////////////////////////////////////////////////////////////////////////////
	// basePrimitive2D class

	namespace drawinglayer
	{
	namespace primitive2d
	{
	/** BasePrimitive2D class

	Baseclass for all C++ implementations of com::sun::star::graphic::XPrimitive2D

	This class is strongly virtual due to the lack of getPrimitiveID() implementation.
	This is by purpose, this base class shall not be incarnated and be used directly as
	a XPrimitive2D.

	Is is derived from boost::noncopyable to make clear that a primitive is a read-only
	instance and copying or changing values is not intended. The idea is to hold all data
	needed for visualisation of this primitive in unchangeable form.

	It is derived from comphelper::OBaseMutex to have a Mutex at hand; in a base
	implementation this may not be needed, but e.g. when buffering at last decomposition
	in a local member, multiple threads may try to decompose at the same time, so locking
	is needed to avoid race conditions seen from the UNO object implementation.

	A method to get a simplified representation is provided by get2DDecomposition. The
	default implementation returns an empty sequence. The idea is that processors
	using this primitive and do not know it, may get the decomposition and process
	these instead. An example is e.g. a fat line, who's decomposition may contain
	the geometric representation of that line using filled polygon prmimitives. When
	the renderer knows how to handle fat lines, he may proccess this primitive directly;
	if not he can use the decomposition. With this functionality, renderers may operate by
	knowing only a small set of primitives.

	When a primitive does not implement get2DDecomposition, it is called a 'Basic Primitive' and
	belongs to the set of primitives which a processor should be able to handle. Practice
	will define this minimal sets of primitives. When defined and the concept is prooved,
	unique UNO APIs may be defined/implemented for these set to allow more intense work
	with primitives using UNO.

	Current Basic 2D Primitives are:

	- BitmapPrimitive2D (bitmap data, evtl. with transparence)
	- PointArrayPrimitive2D (single points)
	- PolygonHairlinePrimitive2D (hairline curves/polygons)
	- PolyPolygonColorPrimitive2D (colored polygons)

	UPDATE: MetafilePrimitive2D (VCL Metafile) is taken off this list since
	it is implemented with the integration of CWS aw078 into DV300m69.

	All other implemented primitives have a defined decomposition and can thus be
	decomposed down to this small set.

	A renderer implementing support for this minimal set of primitives can completely
	render primitive-based visualisations. Of course, he also has to take states into account
	which are representated by GroupPrimitive2D derivations, see groupprimitive2d.hxx

	To support getting the geometric BoundRect, getB2DRange is used. The default
	implementation will use the get2DDecomposition result and merge a range from the
	entries. Thus, an implementation is only necessary for the Basic Primitives, but
	of course speedups are possible (and are used) by implementing the method at higher-level
	primitives.

	For primitive identification, getPrimitiveID is used currently in this implementations
	to allow a fast switch/case processing. This needs a unique identifier mechanism which
	currently uses defines (see drawinglayer_primitivetypes2d.hxx). For UNO prmitive API
	it will be needed to add a unique descriptor (Name?) later to the API.

	This base implementation provides mappings from the methods from XPrimitive2D
	(getDecomposition/getRange) to the appropriate methods in the C++ implementations
	(get2DDecomposition/getB2DRange). The PropertyValue ViewParameters is converted to
	the appropriate C++ implementation class ViewInformation2D.

	This base class does not implement any buffering; e.g. buffering the decompositon
	and/or the range. These may be buffered anytime since the definition is that the primitive
	is read-only and thus unchangeable. This implies that the decomposition and/or getting
	the range will lead to the same result as last time, under the precondition that
	the parameter ViewInformation2D is the same as the last one. This is usually the case
	for view-independent primitives which are defined by not using ViewInformation2D
	in their get2DDecomposition/getB2DRange implementations.
	*/
	class DRAWINGLAYER_DLLPUBLIC BasePrimitive2D
	: private boost::noncopyable,
	protected comphelper::OBaseMutex,
	public BasePrimitive2DImplBase
	{
	private:
	protected:
	public:
	// constructor/destructor
	BasePrimitive2D();
	virtual ~BasePrimitive2D();

	/** the ==operator is mainly needed to allow testing newly-created primitives against their last
	incarnation which buffers/holds the made decompositions. The default implementation
	uses getPrimitive2DID()-calls to test if it's the same ID at last. Overloaded implementation are then
	based on this implementation
	*/
	virtual bool operator==( const BasePrimitive2D& rPrimitive ) const;
	bool operator!=( const BasePrimitive2D& rPrimitive ) const { return !operator==(rPrimitive); }

	/// The default implementation will use getDecomposition results to create the range
	virtual basegfx::B2DRange getB2DRange(const geometry::ViewInformation2D& rViewInformation) const;

	/** provide unique ID for fast identifying of known primitive implementations in renderers. These use
	the the defines from primitivetypes2d.hxx to define unique IDs.
	This method is normally defined using DeclPrimitrive2DIDBlock()
	*/
	virtual sal_uInt32 getPrimitive2DID() const = 0;

	/// The default implementation will return an empty sequence
	virtual Primitive2DSequence get2DDecomposition(const geometry::ViewInformation2D& rViewInformation) const;

	//
	// Methods from XPrimitive2D
	//

	/** The getDecomposition implementation for UNO API will use getDecomposition from this implementation. It
	will construct a ViewInformation2D from the ViewParameters for that purpose
	*/
	virtual Primitive2DSequence SAL_CALL getDecomposition( const ::com::sun::star::uno::Sequence< ::com::sun::star::beans::PropertyValue >& rViewParameters ) throw ( ::com::sun::star::uno::RuntimeException );

	/** The getRange implementation for UNO API will use getRange from this implementation. It
	will construct a ViewInformation2D from the ViewParameters for that purpose
	*/
	virtual ::com::sun::star::geometry::RealRectangle2D SAL_CALL getRange( const ::com::sun::star::uno::Sequence< ::com::sun::star::beans::PropertyValue >& rViewParameters ) throw ( ::com::sun::star::uno::RuntimeException );
	};
	} // end of namespace primitive2d
	} // end of namespace drawinglayer

	//////////////////////////////////////////////////////////////////////////////
	// BufferedDecompositionPrimitive2D class

	namespace drawinglayer
	{
	namespace primitive2d
	{
	/** BufferedDecompositionPrimitive2D class

	Baseclass for all C++ implementations of com::sun::star::graphic::XPrimitive2D
	which want to buffer the decomoposition result

	Buffering the decomposition is the most-used buffering and is thus used my most
	primitive implementations which support a decomposition as base class.

	The buffering is done by holding the last decomposition in the local parameter
	maBuffered2DDecomposition. The default implementation of get2DDecomposition checks
	if maBuffered2DDecomposition is empty. If yes, it uses create2DDecomposition
	to create the content. In all cases, maBuffered2DDecomposition is returned.

	For view-dependent primitives derived from Primitive2DBufferDecomposition more needs
	to be done when the decomposition depends on parts of the parameter ViewInformation2D.
	This defines a standard method for processing these:

	Implement a view-dependent get2DDecomposition doing te following steps:
	(a) Locally extract needed parameters from ViewInformation2D to new, local parameters
	(this may be a complete local copy of ViewInformation2D)
	(b) If a buffered decomposition exists, ckeck if one of the new local parameters
	differs from the corresponding locally remembered (as member) ones. If yes,
	clear maBuffered2DDecomposition
	(d) call baseclass::get2DDecomposition which will use create2DDecomposition
	to fill maBuffered2DDecomposition if it's empty
	(e) copy the new local parameters to the corresponding locally remembered ones
	to identify if a new decomposition is needed at the next call
	(f) return maBuffered2DDecomposition
	*/
	class DRAWINGLAYER_DLLPUBLIC BufferedDecompositionPrimitive2D
	: public BasePrimitive2D
	{
	private:
	/// a sequence used for buffering the last create2DDecomposition() result
	Primitive2DSequence maBuffered2DDecomposition;

	protected:
	/** access methods to maBuffered2DDecomposition. The usage of this methods may allow
	later thread-safe stuff to be added if needed. Only to be used by getDecomposition()
	implementations for buffering the last decomposition.
	*/
	const Primitive2DSequence& getBuffered2DDecomposition() const { return maBuffered2DDecomposition; }
	void setBuffered2DDecomposition(const Primitive2DSequence& rNew) { maBuffered2DDecomposition = rNew; }

	/** method which is to be used to implement the local decomposition of a 2D primitive. The default
	implementation will just return an empty decomposition
	*/
	virtual Primitive2DSequence create2DDecomposition(const geometry::ViewInformation2D& rViewInformation) const;

	public:
	// constructor/destructor
	BufferedDecompositionPrimitive2D();

	/** The getDecomposition default implementation will on demand use create2DDecomposition() if
	maBuffered2DDecomposition is empty. It will set maBuffered2DDecomposition to this obtained decomposition
	to buffer it. If the decomposition is also ViewInformation2D-dependent, this method needs to be
	overloaded and the ViewInformation2D for the last decomposition need to be remembered, too, and
	be used in the next call to decide if the buffered decomposition may be reused or not.
	*/
	virtual Primitive2DSequence get2DDecomposition(const geometry::ViewInformation2D& rViewInformation) const;
	};
	} // end of namespace primitive2d
	} // end of namespace drawinglayer

	//////////////////////////////////////////////////////////////////////////////
	// tooling

	namespace drawinglayer
	{
	namespace primitive2d
	{
	/// support to handle a sequence of primitives as stl vector and convert it during creation
	typedef ::std::vector< BasePrimitive2D* > Primitive2DVector;
	Primitive2DSequence DRAWINGLAYER_DLLPUBLIC Primitive2DVectorToPrimitive2DSequence(const Primitive2DVector& rSource, bool bInvert = false);

	/// get B2DRange from a given Primitive2DReference
	basegfx::B2DRange DRAWINGLAYER_DLLPUBLIC getB2DRangeFromPrimitive2DReference(const Primitive2DReference& rCandidate, const geometry::ViewInformation2D& aViewInformation);

	/// get B2DRange from a given Primitive2DSequence
	basegfx::B2DRange DRAWINGLAYER_DLLPUBLIC getB2DRangeFromPrimitive2DSequence(const Primitive2DSequence& rCandidate, const geometry::ViewInformation2D& aViewInformation);

	/** compare two Primitive2DReferences for equality, including trying to get implementations (BasePrimitive2D)
	and using compare operator
	*/
	bool DRAWINGLAYER_DLLPUBLIC arePrimitive2DReferencesEqual(const Primitive2DReference& rA, const Primitive2DReference& rB);

	/// compare two Primitive2DReferences for equality, uses arePrimitive2DReferencesEqual internally
	bool DRAWINGLAYER_DLLPUBLIC arePrimitive2DSequencesEqual(const Primitive2DSequence& rA, const Primitive2DSequence& rB);

	/// concatenate sequence
	void DRAWINGLAYER_DLLPUBLIC appendPrimitive2DSequenceToPrimitive2DSequence(Primitive2DSequence& rDest, const Primitive2DSequence& rSource);

	/// concatenate single Primitive2D
	void DRAWINGLAYER_DLLPUBLIC appendPrimitive2DReferenceToPrimitive2DSequence(Primitive2DSequence& rDest, const Primitive2DReference& rSource);

	} // end of namespace primitive2d
	} // end of namespace drawinglayer

	//////////////////////////////////////////////////////////////////////////////

	#endif //INCLUDED_DRAWINGLAYER_PRIMITIVE2D_BASEPRIMITIVE2D_HXX

	//////////////////////////////////////////////////////////////////////////////
	// eof