How can I tell if a character doesn't exist in the font?

[freakypie]

I'm writing an app that uses Latin, Cyrillic, and Chinese characters. If a character fails to load it loads a box, but I haven't identified a consistent way to determine if I'm getting the "Not found" box or a real character.

Is there a built in way to determine if a character failed to load?

[lojjic]

Interesting question. My initial reaction is that when you see a box like that it's almost always going to be the fallback glyph for an absent character -- it's possible for it to be some unicode symbol character but it seems like that would be so rare you could usually ignore it ...?

Otherwise, I've used https://fontdrop.info/ as a convenient way to inspect what's included in a given font file, you could try that.

If you're looking for a programmatic way to determine absent characters, that info isn't currently exposed but it wouldn't be a difficult addition to the TextRenderInfo struct.

Also maybe of interest: #13