Computer graphics processing and selective visual display system – Display peripheral interface input device – Light pen for fluid matrix display panel
Patent
1994-03-29
1995-07-04
Brier, Jeffery
Computer graphics processing and selective visual display system
Display peripheral interface input device
Light pen for fluid matrix display panel
345150, G09G 506
Patent
active
054304652
ABSTRACT:
In a bit mapped display environment which has n hardware color look-up tables (CLUTs) where n=1 or more, which also has a limited number of Display Attribute Identification Values, and which may operate under various window systems, such as the X Window System protocol, an apparatus and a method for installing and uninstalling hardware colormaps under the constraint of a finite number of Display Attribute Identification Values, whereby the most recently installed (MRI) policy of the X Window System is followed. The invention provides a scheme which gracefully degenerates to some "color flashing" when Display Attribute Identification Values are exhausted; which allows Display Attribute Identification Values to be uncoupled from colormap management and used for more graphics intensive functions when needed; and which dynamically regenerates when display attributes again become available. The invention also minimizes the rendering of the Display Attribute Planes when a new colormap is installed in a system containing multiple hardware color look-up tables.
REFERENCES:
patent: 4958301 (1990-09-01), Kobayashi
patent: 5025249 (1991-06-01), Seiler et al.
patent: 5091717 (1992-02-01), Carrie et al.
patent: 5128658 (1992-07-01), Pappas et al.
"Computer Graphics: Principles and Practice", Second Edition, by James D. Foley et al., 1990, pp. 166-170 and 443-447.
"High Performance Polygon Rendering" by Kurt Akeley et al., ACM Computer Graphics, vol. 22, No. 4, 1988, pp. 239-246.
Evans Jerald R.
Johnson Deron
Sabella Paolo
Basinski Erwin J.
Brier Jeffery
Sun Microsystems Inc.
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