Hardware arrangement for controlling multiple overlapping window

Details Hardware arrangement for controlling multiple overlapping window Hardware arrangement for controlling multiple overlapping window

1993-08-16

1996-12-24

Bayerl, Raymond J.

395326, G06T 120

Patent

active

055881068

ABSTRACT:
An arrangement for displaying a plurality of video images in multiple windows in a computer graphics system, is described. A CPU (Central Processing Unit) is coupled to a system bus and controls an overall operation of the arrangement. A frame buffer is provided to store one frame video image to be displayed on a display. A plurality of video data capture units acquire respectively a plurality of video images into the arrangement. A plurality of window pixel data transfer controllers are interconnected respectively between the bus and the video data capture units. The window pixel data transfer controllers are arranged to respectively define windows and arranged to respectively transfer the video images to the frame buffer by way of the corresponding windows. A given window pixel data transfer controller of the above-mentioned data transfer controllers is arranged to determine an exposed portion of the corresponding window in the case where the window is overlapped by another window. The given data transfer controller allows the corresponding video image to be supplied to the frame buffer through the exposed portion of the window.

REFERENCES:
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patent: 4806919 (1989-02-01), Nakayama et al.
patent: 5129055 (1992-07-01), Yamazaki et al.
patent: 5257348 (1993-10-01), Roskowski et al.
patent: 5276437 (1994-01-01), Horvath et al.
patent: 5388201 (1995-02-01), Hourvitz et al.
patent: 5471577 (1995-11-01), Lightbody et al.

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