Support text wrapping for CJK characters

[jamesthomasgriffin]

Pass:text and Font:getLines do not wrap CJK characters, just treating text as long words.

Punctuation symbols which contain an implicit space don't break words either.

My understanding of intended behaviour is that text should wrap after characters, unless it has been prohibited (e.g. no punctuation at the start of a line) and that information is contained in the font file.

I took a sample font and sample text from Google Fonts.

[bjornbytes]

The current behavior is soft wrapping after spaces and tabs. It doesn't look like stb_truetype exposes any information about wrapping info. It seems like this might fall under "text shaping"?

[bjornbytes]

BTW, I've been eyeing this library for text shaping:

https://github.com/JimmyLefevre/kb

It seems to have powerful APIs for line breaking (among other things)

https://github.com/JimmyLefevre/kb/blob/main/kb_text_shape.h#L937

[jamesthomasgriffin]

It would be great to support that level of shaping. However I just compiled it as a .dll and it was over 600kb! I assume that's mainly lookup tables, I don't know whether tooling can compress it. Is this a problem? Or could it be a plug-in?

[bjornbytes]

Yeah, 600kb is definitely hard to stomach. It could probably be a plugin that takes a Blob containing the font file, although it would be nice if it could somehow use Font directly (but plugins relying on LÖVR C API is not "officially" supported).