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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帧频转换对于静止图象采用最近帧复制的方式进行插值，对于运动图象则分别采用运动矢量内插及自适应运动补偿方法进行图象内插。

For frame rate convertion, the nearest frame is copied to interpolation for still image, for motive image motion vector interpolation and adaptive motion compensation are respectively used.

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在动画窗口下复制第一帧，将地图图层往左边移动。

In animation window duplicate the first frame and move the map layer towards the left.

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