nanovg is dope. 8 years ago i was attempting to build a visual programming language using that:
https://github.com/jb55/vpl
Also had an svg renderer working at some point.
In NoteDeck the rendering...
Yeah that’s what I’m doing for emoji as well. When rendering text I check through the text for emoji Unicode and pass all the regular text to the default renderer of NanoVG, and for the emojis I have a texture atlas. If the emojis not already in the atlas I call out to CoreText on iOS to render them for me