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

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。

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The code writes to viewport, and the viewport does the mapping to the physical size of the image automatically.

代码负责向这个viewport中写入数据，然后这个viewport自动实现到图像的物理尺寸的自动映射。

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VCL manager provides appropriate virtualization (aggregation, dis-aggregation) of the available hardware resources before mapping the requested image onto that hardware.

在将所请求的映像映射到硬件之前，VCL 管理者为可用的硬件资源提供适当的虚拟化（聚合，解除聚合）。

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