Anti-aliasing raster operations

Details Anti-aliasing raster operations Anti-aliasing raster operations

G - Physics

09

G

354/120, 354/230

G09G 1/14 (2006.01) G09G 5/393 (2006.01)

Patent

CA 1309183

ABSTRACT 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 that is a function of the number of sub- pixels crossed by a portion of a rendered image. The invented circuitry is part of the circuitry used for combining source and destination data which forms the displayed image namely, an anti-aliasing mask and filter, adder/subtractor logic, saturation logic and anti-aliasing logic.

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