Patent ID: 6097388
Filing Date: 2000-08-01
Classification: G09G

Abstract:
A computer-implemented method for managing windows in a raster display, comprising the steps of:generating a first display map of values identifying sequential picture element runs of the raster display having a common set of windows containing the picture elements of the run, an associated window stacking order, and a topmost window to be drawn in the raster display;in response to a window operation in the display, generating a second display map of values identifying sequential picture element runs of the raster display, each run having a common set of windows containing the picture elements of the run, an associated window stacking order, and a topmost window to be drawn in the raster display;comparing said first display map with said second display map to identify picture elements whose topmost window has changed; andrepainting the raster display by writing said changed picture elements with data from the topmost window of the identified picture elements.