Apparatus and method for scrolling text and graphic data in selected portions of a graphic display
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United States of America Patent
Stats
-
Mar 13, 1984
Grant Date -
N/A
app pub date -
Aug 12, 1981
filing date -
Aug 12, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus and method for scrolling windows of both graphic and graphic encoded text information on a raster scan display. The apparatus includes a processor which references a program store, and a video refresh buffer, the buffer containing graphic and graphic encoded text data in a pixel format adapted for directly refreshing the display. The processor is operated under control of the program store and responsive to information specifying the pixel locations of opposite corners of a window to be scrolled and the number of rows to be scrolled for calculating the size and location in the display refresh buffer of the window to be scrolled, and for moving the number of rows to be scrolled from source locations to destination locations within the window in the display refresh buffer.
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Cited Art Landscape
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