The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 15, 1998
Filed:
Apr. 25, 1996
G Eric Engstrom, Kirkland, WA (US);
Craig G Eisler, Kirkland, WA (US);
Microsoft Corporation, Redmond, WA (US);
Abstract
A method for flipping an image in a window using overlays involves creating an overlay flipping structure and using this structure to control 'flipping' of an overlay image in a display device that supports overlays. A display device interface includes services to create and manipulate an overlay flipping structure including a front buffer and a back buffer. To flip in a window, an application program draws its image to the back buffer of the flipping structure while the overlay control in the display controller reads the overlay image from the front buffer. The overlay control superimposes the overlay in the front buffer with the image in the frame buffer. The display device interface controls the flipping of the overlay by determining when it can change the address of the overlay image used by the display controller without causing flipping.