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。

youdao

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。

youdao