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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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%.

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复制这四个帧，隐藏闭着的眼睛层，显示睁着的眼睛层。

Duplicate these four frames and in layer window hide the closed eye layer and unhide the open eye layer.

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