wxiaoguang a8fd76557b Better builtin avatar generator (#17707) ...

This PR fixes the builtin avatar generator.

1. The random background color makes some images very dirty. So now we only use white background for avatars.
2. We use left-right mirror avatars to satisfy #14799
3. Fix a small padding error in the algorithm

2021-11-20 01:10:41 +08:00

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