复制帧。将圆圈向上移动一些，将透明度改变为100%。
Duplicate frame. Move the circle layer upwards and change the opacity to 100%.
它是由层来解决这个问题，并造成损坏，失去了复制帧使第三层是可以承担工作失误签证线路。
It is up to this layer to solve the problems caused by damaged, lost, and duplicate frames so that layer 3 can assume it is working with an error-free line.
注意：在此函数中，长为 chunkSize、宽为 chunkSize 的像素矩形是如何从恰当的帧复制到绘图表面的。
Notice how in this function a rectangle of chunkSize by chunkSize pixels is copied from the appropriate frame to the drawable surface.
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