Add emoji for example project in https://github.com/godotengine/godot-demo-projects/tree/master/gui/bidi_and_font_features

[Lyumih]

Add emoji for example project in https://github.com/godotengine/godot-demo-projects/tree/master/gui/bidi_and_font_features

Linked with godotengine/godot#98110

[Calinou]

This will require committing an emoji font for it to display consistently on all platforms, and an emoji font is pretty large (24 MB for Noto Color Emoji). This would increase repository size a fair bit, while we try to keep it fairly small so it's easy for users to clone (shallow clones aren't suited for contributing).

Of course, we can rely on system fonts as an alternative, but they can't be used on the web platform. We could have a system in place to download then load the emoji font at runtime on the web platform only, but this would add some complexity to the demo's script.

[bruvzg]

For the demo we can subset emoji font and keep only a few characters used in the project.

[Calinou]

For the demo we can subset emoji font and keep only a few characters used in the project.

I've started to look at subsetting Noto Color Emoji, but I can't get the font to show up in Godot correctly: papandreou/subset-font#26

[bruvzg]

I've started to look at subsetting Noto Color Emoji, but I can't get the font to show up in Godot correctly

HarfBuzz subsetter seems to work with the for downloaded from https://fonts.google.com/noto/specimen/Noto+Color+Emoji

% cat list.txt
U+1F302
U+1F346
% hb-subset --unicodes-file=list.txt --output-file=emoji_sub.ttf NotoColorEmoji.ttf

The result is a 4 kb ttf file, and it is working in Godot (labels using full font and subsetted font, fallback is disabled for both):

Edit: I was using old version of the font, current one is not working with Godot at all (Failed to create SVG canvas), will check it later.

[bruvzg]

I was using old version of the font, current one is not working with Godot at all (Failed to create SVG canvas), will check it later.

Seems like ThorVG is broken again, tvg::IteratorAccessor that was used to determine glyph bounds (since TVG can't work with SVG without viewBox, and none of the fonts have it) now seems to do nothing, so SVG fonts are fully broken.