1. A method for determining for a pixel a coverage mask reflecting an orientation of an original edge vector, which pixel is to be employed for displaying at least a part of a geometric primitive on a display, wherein said original edge vector represents an oriented edge of said geometric primitive, said method comprising: a) determining one of four quadrants of a Cartesian coordinate system to which said original edge vector belongs due to its orientation; b) transposing said original edge vector into a predetermined one of said four quadrants; c) fetching a stored coverage mask which is associated at least indirectly to said transposed edge vector; and d) transforming said fetched coverage mask to said quadrant to which said original edge vector belongs.