Data display system

Details Data display system Data display system

G - Physics

09

G

375/12

G09G 3/00 (2006.01) G09G 5/14 (2006.01)

Patent

CA 1229439

ABSTRACT OF THE DISCLOSURE A display system which is used as the input-output terminal of a data processing system which may be used for concurrent processing of application. Each application may have a viewport on the display screen and viewports may overlap. In order to write to low priority viewports without disturbing data displayed in those of a higher priority a mask buffer is used to prevent overwriting of high priority viewports. More particularly, this application describes a multi-viewport system in which the writing of application data into overlapping viewports is controlled by a screen manager. The screen manager maintains a series of priority flags for each pixel (bit in the screen buffer) relating to the layers of the viewports, and a viewport order list. Only the current, or higher priority viewport is written into by an application. There is no provision for having more than one application writing into a lower priority viewport overlapped by the current viewport other than serially, i.e. writing to one viewport is completed before processing the next one. The main advantage of the present invention is that lower priority viewports may be written into requiring only a single pass over the data held in a data buffer, and it is able to handle the most complex of overlaid viewports.

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