然后，它使用一个映射填充该区域，这个映射是用于对每个笔触的绘图区域着色的图像缓冲区。

It then fills the area with a mapping, which is an image buffer used to color up the painting area of each stroke.

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窗口服务器为客户提供了一块共用内存区域用来绘图，然后(用gpu)将其混合为帧缓冲。

The window server provides a region of Shared memory to clients for drawing and then composites this into the frame buffer (on the GPU).

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该模式为图表绘图提供了更多的屏幕区域。

This mode provides more screen area for diagram drawing.

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