SDL解析SDL视频处理（2）
怎样向 SDL_SetVideoMode返回的缓冲区中填写数据，让它显示在窗口当中呢？官方文档中提供了一个putpixel函数，非常合适。 这个函数就是将某个像素点值写向缓冲区surface的（x，y）位置当中。surface是SDL_Surface类型的结构体，其中的pixels成员就代表了缓冲
怎样向 SDL_SetVideoMode返回的缓冲区中填写数据，让它显示在窗口当中呢？官方文档中提供了一个putpixel函数，非常合适。
这个函数就是将某个像素点值写向缓冲区surface的（x，y）位置当中。surface是SDL_Surface类型的结构体，其中的pixels成员就代表了缓冲区的首地址了。
但是，pixels成员其实就是一段内存而已，虽然它代表了抽象缓冲区，但是在pixels中的数据没有真正的更新到设备之前，这个新修改的像素点是不会被显示的。于是，我们还需要这样一个函数：
void SDL_UpdateRect(SDL_Surface *screen, Sint32 x, Sint32 y, Sint32 w, Sint32 h);
这个函数能够将screen中某一个矩形区域刷新。x，y代表了要刷新的矩形区域的坐标，w，h则代表了该区域的宽和高，当这连个值是0可以表示更新所有的缓冲区。此时，如果该区域恰好包含了修改后的图形，那么这就表示图形被显示了。
可想而知，SDL_UpdateRect函数也应该是硬件相关的。SDL最终会真正去调用各个SDL_VideoDevice的UpdateRect函数指针成员，在这里实现真正的屏幕刷新。
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