BezierBounds
BRect r = BezierBounds(bezier, 4);
r = BezierBounds(bezier, 4, fWidth, LineCapMode(), LineJoinMode(), LineMiterLimit());
BRect bounds = BezierBounds(points, numOfPoints);
BRect BezierBounds(BPoint* points, int numOfPoints);
BRect BezierBounds(BPoint* points, int numOfPoints, float penSize, cap_mode capMode, join_mode joinMode, float miterLimit);