SPLINEBOOL_MODE

SPLINEBOOL_MODE_AMINUSB	Subtract B from A.
SPLINEBOOL_MODE_BMINUSA	Subtract A from B.
SPLINEBOOL_MODE_UNION	Union of both A and B.
SPLINEBOOL_MODE_AND	And intersection (overlap) of region of A and B.
SPLINEBOOL_MODE_OR	Or intersection (outside of overlap) of region of A and B.
SPLINEBOOL_MODE_INTERSECTION	Intersection (all segments inside and out) of region of A and B.