Think of each function as being another page or destination in your site or application.
设想每个函数都是站点或应用程序的一个页面或目标。
Draw function copies the source pixel memory area into the destination memory area.
绘制函数将源像素内存区复制到目标内存区。
Draw function copies the source pixel memory area into the destination memory area.
绘制函数将源像素内存区复制到目标内存区。
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