Notice how in this function a rectangle of chunkSize by chunkSize pixels is copied from the appropriate frame to the drawable surface.

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。

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This shows that the function wib was called from main at line 21 (a quick 'list 21' will confirm this), that wib is in frame 0 and main in frame 1.

此结果显示了在main的第21行中调用了函数wib(只要使用' list 21 '就能证实这一点)，而且wib在0号帧中，main在1号帧中。

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This function moves each frame back in time from the last image in the sequence to the first.

该函数按时间反向移动各帧，从图像序列的最后一幅到最前一幅。

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