发明名称 |
METHOD AND APPARATUS FOR CONSTRUCTING A FRAME BUFFER WITH A FAST COPY MEANS |
摘要 |
THE INVENTION A method and apparatus for quickly copying a first frame region into a second frame region. A video memory array comprising a plurality of video random access memory devices is divided into at least two frame regions. A background image is rendered by a central processing unit into a background frame region within the video memory array. The central processing unit then requests the background image in the background frame region to be copied into a new frame region in the video memory array. A dedicated circuit copies the entire background image in the background frame region into the new frame region. The dedicated circuit operates by using a serial data register within each video random access memory device during the vertical retrace period of a video timing signal. The dedicated circuit performsthe background frame copy without requiring any processing resources from the central processing unit. 32
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申请公布号 |
CA2130050(A1) |
申请公布日期 |
1995.02.14 |
申请号 |
CA19942130050 |
申请日期 |
1994.08.12 |
申请人 |
FIRSTPERSON, INC. |
发明人 |
FORREST, CRAIG S.;FRANK, EDWARD H.;NAUGHTON, PATRICK J. |
分类号 |
G09G5/00;G06T1/60;G09G5/36;G09G5/393;G09G5/397;G09G5/399;(IPC1-7):G06F15/66 |
主分类号 |
G09G5/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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