Selective scrolling of displays in a multiple window raster

Details Selective scrolling of displays in a multiple window raster Selective scrolling of displays in a multiple window raster

G - Physics

09

G

375/23

G09G 1/00 (2006.01) G09G 5/14 (2006.01) G09G 5/34 (2006.01)

Patent

CA 1184326

Abstract: Apparatus and Method for Scrolling Text and Graphic Data in Selected Portions of a Graphic Display 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 refresh- ing the display. The processor is operated under control of the program store and responsive to information speci- fying 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 o 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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