Computer graphics processing and selective visual display system – Display peripheral interface input device – Light pen for fluid matrix display panel
Patent
1997-04-17
1999-10-12
Shalwala, Bipin H.
Computer graphics processing and selective visual display system
Display peripheral interface input device
Light pen for fluid matrix display panel
345509, 345515, 345516, 382296, 348583, G09G 534
Patent
active
059661160
ABSTRACT:
A computer system is provided which employs a hardware rotation unit capable of rotating a raster-scan portrait image by 90 degrees in a clockwise or counter-clockwise direction in order to create a landscape image on a raster-scan display device. Rotation of a portrait image is accomplished by a mapping of pixel information associated with the portrait image to corresponding frame buffer locations necessary to properly display the portrait image as a landscape image. A video controller incorporating the hardware rotation unit stores only pixel information associated with the landscape image in a frame buffer. Dedicated circuitry within the hardware rotation unit allows full support of portrait image data read and write operations involving the landscape image pixel information stored in the frame buffer.
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Advanced Micro Devices , Inc.
Chang Kent
Daffer Kevin L.
Kowert Robert C.
Shalwala Bipin H.
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