A method and apparatus for managing background and foreground display images. Graphics memory for images which are rendered in software is referenced by a processor using an MMU (memory mapping unit) having MMU tables. The graphics memory includes a portion for on-screen display, and a portion which...http://www.google.com.tw/patents/US6326969?utm_source=gb-gplus-share專利 US6326969 - Emulating screen overlays by flip-mapping memory
