Hardware implementation for providing raster offsets in a graphi

Details Hardware implementation for providing raster offsets in a graphi Hardware implementation for providing raster offsets in a graphi

1989-02-08

1993-12-28

Herndon, H. A.

G06F 1520

Patent

active

052747557

ABSTRACT:
An apparatus for implementing, in hardware, circuitry for adding a raster offset to screen coordinates in a graphics display subsystem for the purpose of displaying the image in a window which may be moved by a user to an arbitrary position on a screen display. Specifically, a pair of raster offsets, one for X coordinates and one for Y coordinates, are stored in X and Y raster offset registers. The X and Y raster offsets correspond to the offset of an active window from the origin of the screen display. These offsets are added to each coordinate which is to be displayed within the active window in a manner which does not result in any additional overhead.

REFERENCES:
patent: 4570236 (1986-02-01), Rebel et al.
patent: 4652760 (1987-03-01), Kondo et al.
patent: 4689824 (1987-08-01), Mitchell et al.
patent: 4774678 (1988-09-01), David et al.
patent: 4837844 (1989-06-01), Urushibata

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