谷歌地圖文字渲染原理

谷歌地圖的文字數據是後端渲染好，放到tile的pbf格式數據中了，後端渲染的是帶顏色的文字。

pbf數據拿過來以後一頓處理，從裏面找出文字圖像數據，下面的spritemapImage就是

 

 

手動把這個數據拷出來，本身建立一個canvas以後長這模樣，黃色是爲了方面看加的背景色

 

圖像數據以下：其中width：99，height：27

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