efill should process both non-zero and evenodd fills. #2
Description
The sorting of the positions across the scanline is fine, but when you reach an active line segment, there will be a clockwise or counter-clockwise directioning. It's not too hard to count the insidedness of an object based on the directionality of the enclosing polygons. This is the noted difference with non-zero vs. evenodd filling. This requires storing the directionality of the graph lines being crossed. But, would give OR and AND like fill capabilities.