当交换内存页时显示就发生更改，所以您不需要将Image对象从程序内存复制到显示内存；您只要更改视频指针，显示就会发生更改。
The display changes when you swap memory pages so you need not copy an Image object from program memory to video memory; you merely change video Pointers and the display changes.
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.
注意：当系统供电的，视频监控可以长达30秒，显示图像，这取决于系统中安装的内存量在。
NOTE: When powering on the system, the video monitor can take as long as 30 seconds to display an image, depending on the amount of memory installed in the system.
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