Display controller with enhanced video window clipping

Details Display controller with enhanced video window clipping Display controller with enhanced video window clipping

1995-06-07

1998-06-16

Feld, Joseph H.

395340, 395508, G06F 314

Patent

active

057684910

ABSTRACT:
A computer system includes a display controller which supports video display. The display controller includes circuitry for determining which portions of one or more video windows should be written to the frame buffer responsive to the locations of other screen objects which may overlie the video window on the display. An unused portion of frame buffer memory is used to stored a plurality of transition groups, each group defining which portions of the video window are visible within a range of scanlines. The transition information is used by clipped circuitry to enable or disable writing of video information to the frame buffer.

REFERENCES:
patent: 5321810 (1994-06-01), Case et al.
patent: 5353391 (1994-10-01), Cohen et al.

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