Basically, this changeset implements BShape::ArcTo(). In more detail:

* Added BShape::ArcTo() and BShapeIterator::IterateArcTo(), using a previously
   unused virtual slot. (Added the symbols for binary compatibility for GCC2
   and GCC4.)
 * Added operator=(), operator==() and operator!=() to BShape.
 * Added BShape::BezierTo() version taking three points, which is sometimes
   more convenient.
 * Added the four new shape data ops OP_LARGE_ARC_TO_CW, OP_LARGE_ARC_TO_CCW,
   OP_SMALL_ARC_TO_CW and OP_SMALL_ARC_TO_CCW. For a single arc, provided the
   radius is large enough, there are four possibilities to draw the arc, these
   are controlled by the two boolean flags to ArcTo() and mapped to the new
   commands accordingly.
 * Some style cleanup in Shape.cpp (sorry for mixing it up, but it gets
   worse below...)
 * Added ShapeTest to src/tests/servers/app.
 * Changed the way BShapes are transformed from view to screen space in the
   app_server. For arcs, it would be nontrivial to apply a proper transformation,
   it's much easier to let AGG take care of it. This affects ServerPicture as
   well.
 * Wrapped iterating the BShape into try/catch blocks in ShapeIterator. But
   I really don't understand the purpose of the class in the first place.
   Maybe it can now be dropped, since coordinates don't have to be transformed
   in place anymore.
 * Refactored copy&paste shape iteration code in Painter. The transformation
   to screen space happens there.
 * Since RemoteDrawingEngine needed to be adopted anyway, I also updated
   it for the new DrawString() with offsets version. But the client still needs
   to be adapted.
 * Style cleanup in Painter.h


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@35905 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/os/interface/Shape.h

@@ -30,10 +30,13 @@ public:
 									BPoint* bezierPts);
 	virtual	status_t			IterateClose();
 
+	virtual	status_t			IterateArcTo(float& rx, float& ry,
+									float& angle, bool largeArc,
+									bool counterClockWise, BPoint& point);
+
 			status_t			Iterate(BShape* shape);
 
 private:
-	virtual	void				_ReservedShapeIterator1();
 	virtual	void				_ReservedShapeIterator2();
 	virtual	void				_ReservedShapeIterator3();
 	virtual	void				_ReservedShapeIterator4();
@@ -53,6 +56,11 @@ public:
 	virtual	status_t			Archive(BMessage* archive,
 									bool deep = true) const;
 
+			BShape&				operator=(const BShape& other);
+
+			bool				operator==(const BShape& other) const;
+			bool				operator!=(const BShape& other) const;
+
 			void				Clear();
 			BRect				Bounds() const;
 
@@ -61,6 +69,13 @@ public:
 			status_t			MoveTo(BPoint point);
 			status_t			LineTo(BPoint linePoint);
 			status_t			BezierTo(BPoint controlPoints[3]);
+			status_t			BezierTo(const BPoint& control1,
+									const BPoint& control2,
+									const BPoint& endPoint);
+			status_t			ArcTo(float rx, float ry,
+									float angle, bool largeArc,
+									bool counterClockWise,
+									const BPoint& point);
 			status_t			Close();
 
 private: