Computer graphics processing and selective visual display system – Computer graphic processing system – Plural graphics processors
Patent
1995-05-08
1999-02-02
Wu, Xiao
Computer graphics processing and selective visual display system
Computer graphic processing system
Plural graphics processors
345509, G09G 500
Patent
active
058671781
ABSTRACT:
The transfer of video and graphic data from a frame buffer to a display system is interleaved in a manner which permits operation with a reduced memory bandwidth. For those scan lines of a display in which the video information appears, video data is retrieved from the frame buffer during the horizontal blanking time of the scan. Graphical data is retrieved from the memory during the active portion of horizontal scan line. By alternating the retrieval of data in this manner, a lower bandwidth operation can be employed, thereby reducing the expenses of the memory. An address translator permits video and graphic data that is stored in different respective formats to be retrieved with a consistent addressing approach. The use of multiple color look-up tables permits full-color video to be displayed even if limited-color graphics are being employed.
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Baker Paul A.
Murphy Michael W.
Apple Computer Inc.
Wu Xiao
LandOfFree
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