Computer graphics processing and selective visual display system – Computer graphic processing system – Interface
Patent
1997-06-25
1999-02-16
Tung, Kee M.
Computer graphics processing and selective visual display system
Computer graphic processing system
Interface
345191, 395565, G06F 1300
Patent
active
058725768
ABSTRACT:
In order to provide a mask data generator operating at a sufficient speed with a small circuit scale for generating mask data to mask a sequence of drawing data composed of a plurality of data blocks, the mask data generator of the invention has a first and a second mask data generation circuits (200, 201), each comprising; bit pattern extracting means (211) for obtaining a first bit pattern indicating a boundary block wherein pixel data designated by address data are included and a second bit pattern indicating a position of the pixel data in the boundary block; a boundary byte discrimination circuit (216) for discriminating the boundary block making use of the first bit pattern; and an array of multiplexers (217) each corresponding to each of the plurality of data blocks, one multiplexer, which corresponds to the boundary block, selecting the second bit pattern controlled by the boundary byte discrimination circuit, and each of the other multiplexers selecting either a bit pattern of all `0` or a bit pattern of all `1` according to each position of corresponding data block relative to the boundary block controlled by the boundary byte discrimination circuit.
REFERENCES:
patent: 4180861 (1979-12-01), Armstrong et al.
patent: 4943801 (1990-07-01), Oguchi
patent: 5729725 (1998-03-01), Kato et al.
Luu Sy Danh
NEC Corporation
Tung Kee M.
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