emilk/egui

Automatically load system fonts when needed

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#5,233 opened on Oct 8, 2024

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 (2 comments) (8 reactions) (0 assignees)Rust (29,051 stars) (2,037 forks)batch import
eframeeguihelp wantedtext

Description

Currently egui only supports glyphs available in fonts that has been explicitly installed with ctx.set_fonts.

It would be great if there was a way for egui to tell it's integration "The user wanted to show a Chinese glyph, but no current font has support for that" and then have eframe respond by automatically finding such a font on the system, e.g. by downloading it.

Related:

Contributor guide

Tech stack
rust
Domain
frontend
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
3-5 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Rustegui basicsfont handling concepts
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50
Research direction
Investigate how egui currently handles fonts in `crates/egui/src/fonts.rs` and eframe's font management. Look at the referenced PR #1687 for previous attempts. Determine a way to detect missing glyphs and trigger font loading from the system. Consider using font kit or similar crates for system font discovery. Engage with comments in the issue for design discussion.