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.
只可以显示黑色像素和白色像素的视频显示器只需要每像素一位内存。
A video display capable of displaying only black pixels and white pixels requires only one bit of memory per pixel.
只可以显示黑色像素和白色像素的视频显示器只需要每像素一位内存。
A video display capable of displaying only black pixels and white pixels requires only one bit of memory per pixel.
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