emilk/egui

Automatically load system fonts when needed

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#5,233 opened on Oct 8, 2024

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eframeeguihelp wantedtext

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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

Research direction
Investigate egui's font system to understand how fonts are installed and glyphs are rendered, then explore platform specific APIs (e.g., fontconfig on Linux, CoreText on macOS, DirectWrite on Windows) to retrieve system fonts for fallback. Consider implementing a fallback mechanism that triggers when a glyph is not found.
Tech stack
rust
Domain
desktop
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.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Rust
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65