In the checkEvents function, the stored mouse coordinates are forced into a grid of chunkSize by chunkSize squares.

在函数 checkEvents中，鼠标坐标强制保存在 chunkSize 的正方形网格中。

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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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At a chunkSize of 1, this will create a per-pixel correct rendering of the distortion algorithm, while each increase in chunkSize will drastically reduce the number of SDL_BlitSurface calls required.

chunksize取1将得到失真算法的逐像素矫正呈现。增大chunkSize将大大减少SDL_BlitSurface的调用次数。

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