Method and apparatus in a data processing system for updating color buffer window identifies when an overlay window identifier is removed

摘要

A method and apparatus in a data processing system for updating a buffer containing display information used to display pixels from a first layer and a second layer on a display in the data processing system. Display information is identified for pixels in the first layer in a region corresponding to a removal of pixels being displayed in the second layer. This identification is performed using a data structure containing display information for displaying pixels in the first layer and pixels in the second layer to form identified display information. Display information in the buffer is updated using identified display information.