公开(公告)号：US5850232A

公开(公告)日：1998-12-15

申请号：US639333

申请日：1996-04-25

Applicant: G. Eric Engstrom ,  Craig G. Eisler

Inventor： G. Eric Engstrom ,  Craig G. Eisler

IPC: G09G5/14 ,  G09G5/399 ,  G06F13/00

CPC classification number: G09G5/14 ,  G09G5/399

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.

Abstract translation: 一种用于使用覆盖来翻转窗口中的图像的方法涉及创建覆盖翻转结构并且使用该结构来控制覆盖图像在支持覆盖的显示设备中的“翻转”。 显示设备接口包括用于创建和操纵包括前缓冲器和后缓冲器的覆盖翻转结构的服务。 为了在窗口中翻转，应用程序将其图像绘制到翻转结构的后缓冲区，而显示控制器中的覆盖控件从前缓冲区读取叠加图像。 覆盖控制将叠加层叠加在帧缓冲区中的前缓冲区中。 显示设备接口通过确定何时可以改变显示控制器使用的覆盖图像的地址而不引起翻转来控制翻转。