Function boolean_op_tree_d 

pub fn boolean_op_tree_d(
    clip_type: ClipType,
    fill_rule: FillRule,
    subjects: &PathsD,
    clips: &PathsD,
    polytree: &mut PolyTreeD,
    precision: i32,
)

Perform a boolean operation on PathsD with PolyTreeD output. Direct port from clipper.h BooleanOp (PolyTreeD overload).