A method and apparatus for performing anti-aliasing of rendered lines, text and images displayed by a workstation on a video display. The anti-aliasing is performed by logically dividing each addressable frame buffer pixel into sixteen sub-pixels and generating a gray scale value for the displayed pixel...http://www.google.co.uk/patents/US4908780?utm_source=gb-gplus-sharePatent US4908780 - Anti-aliasing raster operations utilizing sub-pixel crossing information to control pixel shading
