`font_add_async` for non-hanging font load for language with many glyphs.

[Ttanasart-pt]

Is your feature request related to a problem?

When working with external localization or customization where the user can use their own font in runtime. Loading font with font_add will freeze the program depending on the size of the font file. E.g. Chinese font with ten-thousands of glyphs can take seconds to load, thus reducing the responsiveness of the program.

Describe the solution you'd like

Add asynchronous font_add function, where font loading can be done in other threads while the program is running. With this, you can start the program with some dummy font while waiting for the async return.

Describe alternatives you've considered

• Cache loaded font texture (surface_save) and load back (sprite_add > font_add_sprite). This method is slower than font_add
• Provided the fonts for all supported languages in the executable. This method will remove the customization aspect and will increase the exe file size since each language also needs multiple fonts for different sizes.

Additional context

No response

[Totobal5]

please

[gnysek]

Btw. font adding in game have much more issues. From what I remember, it always loads all gylphs and totally ignore most of settings.