The window server provides a region of Shared memory to clients for drawing and then composites this into the framebuffer (on the GPU).
窗口服务器为客户提供了一块共用内存区域用来绘图,然后(用gpu)将其混合为帧缓冲。
2
The obvious disadvantage to this was that all processes had access to the framebuffer, so could corrupt the display easily and synchronizing drawing between applications was very difficult.