定义变量且检查视频接口是否可用之后，使用硬件视频内存的显示表面初始化。
After defining variables and checking to see if the video interface is available, a display surface is initialized that USES hardware video memory.
定义变量且检查视频接口是否可用之后，使用硬件视频内存的显示表面初始化。
After defining variables and checking to see if the video interface is available, a display surface is initialized that USES hardware video memory.
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