Double buffer support in Framebuffer?

[siqiao chen <siqiaochen@xxxxxxxxx>]

Hello, Could I ask how do I enable double buffer support in FrameBuffer device?

I think I could manually increase xres_virtual/yres_virtual to 2 times of the display size in video driver and swap xoffset/yoffset after VSync.  But could I know if this is the right way to do double buffering or this function is already built-in?

                                                                           Thank you!

                                                                                                                                Philip Chen

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