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Method for asynchronously maintaining an image on a display device

DC
  • US 5,566,287 A
  • Filed: 06/28/1994
  • Issued: 10/15/1996
  • Est. Priority Date: 06/28/1994
  • Status: Expired due to Term
First Claim
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1. In a processing system executing an application program displaying a plurality of graphic objects, a method for asynchronously maintaining an image on a display device, comprising the steps of:

  • receiving a drawing request from the application program;

    determining a drawing area of the image in response to the received drawing request;

    inserting a new entry representing the drawing area into a list of a plurality of entries each representing respective drawing areas;

    receiving an image update request from the application program;

    retrieving one of the plurality of entries representing drawing areas from the list; and

    requesting that respective graphic objects be redrawn if any portion of the graphic object lies within the drawing area represented by the retrieved entry.

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