Graphics display controller for transferring figure data to over

Details Graphics display controller for transferring figure data to over Graphics display controller for transferring figure data to over

1988-02-16

1991-01-08

Shaw, Dale M.

Boots, shoes, and leggings

340724, G06F 1562

Patent

active

049841831

ABSTRACT:
A graphics display controller for transferring figure data to an overlapping portion of a destination area and a drawing-enable area, the drawing-enable area being defined by a clipping rectangle having a diagonal line defined by first and second coordinate data. The controller includes a comparator comparing the coordinate data of each word in the destination area with the first and second coordinate data, a first mask data circuit responding to a comparison result from the comparator to generate first mask data designating bit or bits of each word of the destination area contained in the drawing-enable area, a second mask data circuit responding to a position of the word of the destination area to generate second mask data designating bit or bits of the word containing the destination area, and a drawing control circuit writing the figure data into the bit or bits designated by both of the first and second mask data.

REFERENCES:
patent: 4688032 (1987-08-01), Saito et al.
patent: 4710767 (1987-12-01), Sciacero et al.
patent: 4731606 (1988-03-01), Bantz et al.
patent: 4779210 (1988-10-01), Katsura et al.

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