Unlike X11, the policy for compositing and managing windows is implemented entirely in the window server.
与X11不同的是，用于合成和管理窗口的策略完全是在窗口服务器中实行的。
The window server provides a region of Shared memory to clients for drawing and then composites this into the frame buffer (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。
These days, the window server is implemented on top of OpenGL, and the 2D drawing is handled either in software or by sending OpenGL commands to the window server, exactly as would happen with X11.
现在，窗口服务器是在OpenGL的上层运行的，而2D绘图则由软件或者向窗口服务器发送OpenGL命令来处理，完全和X11一样。
An event generated by the window server when the machine is switched on.
启动事件：开机时候窗口服务器产生的一个事件。
A way of drawing to the screen without using the window server.
直接屏幕访问：不使用窗口服务器对屏幕进行描绘的方法。
A way of drawing to the screen without using the window server. As this avoids client-server communication, it is much faster.
直接屏幕访问：不使用窗口服务器对屏幕进行描绘的方法。这样避免了客户端同服务器端的通信，速度得到很好提升。
A way of drawing to the screen without using the window server. As this avoids client-server communication, it is much faster.
直接屏幕访问：不使用窗口服务器对屏幕进行描绘的方法。这样避免了客户端同服务器端的通信，速度得到很好提升。
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