当窗体的大小改变时，就会提取这个字体 vector，并将适当的缩放因子应用于字体大小。
When the zoom view of the form was changed, the vector of fonts was fetched and the appropriate zoom factor was applied to the font sizes.
cairo支持可缩放字体，其中包含给定字体大小的缓存标准。
Cairo understands scaled fonts, which contain caching metrics for a given font size.
全球变焦比率(百分比)和字体大小缩放范围的申请。
Global zoom ratio (by percentage) and range of font size to apply zooming to.
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