Multiplexor implementation for raster operations including...

Details Multiplexor implementation for raster operations including... Multiplexor implementation for raster operations including...

G - Physics

09

G

354/120, 354/230

G09G 5/393 (2006.01)

Patent

CA 1309184

ABSTRACT A multiplexor implementation of circuitry for performing Boolean raster operations in a workstation whose functions include the display of graphics images using multiple planes and having foreground and background colors. The invented circuitry includes a plane raster-op select circuit and a Boolean raster-op circuit. The plane raster- op select circuit selects a Boolean raster operation to be performed for each plane of graphics information as a function of foreground and background color control signals. The selected Boolean raster operation for each plane is then input to a set of multiplexors and the selected Boolean raster operation is performed on the control inputs to the multiplexors which combines source and destination data for each plane according to the selected Boolean operation for that plane.

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