Sprite cursor with edge extension and clipping

Details Sprite cursor with edge extension and clipping Sprite cursor with edge extension and clipping

1990-12-18

1993-02-09

Oberley, Alvin E.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340721, G09G 508

Patent

active

051855976

ABSTRACT:
A circuit for generating an N by M pixel sprite cursor having edge extension features which are clipped to only appear in preselected windows on a video display. The circuit provides edge extension by extending the pattern appearing in the pixels located along the four edges of the sprite cursor towards the corresponding boundaries of the display. The circuit clips the cursor to preselected windows by determining on a pixel-by pixel basis which window owns the pixel to be displayed and whether the window will permit a cursor to appear in it.

REFERENCES:
patent: 3911419 (1975-10-01), Bates et al.
patent: 4454507 (1984-06-01), Srinivasan et al.
patent: 4545070 (1985-10-01), Miyagawa et al.
patent: 4642790 (1987-02-01), Minshull et al.
patent: 4670752 (1987-06-01), Marcoux
patent: 4710767 (1987-12-01), Sciacero et al.

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