Fast clear technique for display regions having subregions

Details Fast clear technique for display regions having subregions Fast clear technique for display regions having subregions

2006-05-23

2006-05-23

Bella, Matthew C. (Department: 2676)

Computer graphics processing and selective visual display system

Computer graphics processing

Graphic manipulation

C345S502000, C345S626000, C345S627000, C345S628000

Reexamination Certificate

active

07050069

ABSTRACT:
A technique for performing clear operations in a region having a subregion. Responsive to a first clear command: perform an initialization in which stale information is eliminated from pixels outside the subregion. Responsive to subsequent clear commands: update a current clear count for the region; and write the updated current clear count into clear count values associated with pixels outside the subregion. Prior to creating the subregion, a conventional fast clear technique may be employed in the region. After creating the subregion and during its life, the inventive technique may be employed. After the subregion is discontinued, the conventional technique may once again be employed. The inventive technique may be employed optionally depending on the percentage of the region's area occupied by the subregion.

REFERENCES:
patent: 5805868 (1998-09-01), Murphy
patent: 6348919 (2002-02-01), Murphy

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