1. A method, comprising: using at least one processing device to: determine, based on an inclination of an edge of a graphics primitive relative to one of two reference directions of a screen, an error coefficient representative of a distance along one of the reference directions of the screen of said edge from a center of a pixel of the screen; associate a transparency coefficient to said pixel, based on said error coefficient; and select a subsequent pixel to process based on the error coefficient of the pixel.