alacritty/alacritty

Implement upscaling for bitmap fonts in font's crate FreeType/Fontconfig backend.

Open

#3255 opened on Jan 27, 2020

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 (1 comment) (5 reactions) (0 assignees)Rust (64,070 stars) (3,461 forks)batch import
B - missing featureP - lowS - fonthelp wanted

Description

Fontconfig provides us with fixup factor that we should use to scale bitmap fonts. Currently alacritty can only perform downsampling, however it'll be nice to have upscaling for bitmap fonts, since they often has pixelsizefixupfactor more than 1.

Contributor guide

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.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Rust programmingFreeType basicsAlacritty codebase
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40
Research direction
The issue requests implementing upscaling for bitmap fonts using the fixup factor provided by Fontconfig. The relevant code is likely in the FreeType/Fontconfig backend, possibly in files like `src/font/ft.rs` or similar. The discussion may need to explore how `pixelsizefixupfactor` is currently used and where downsampling is implemented. The single comment (if any) or the issue itself does not provide further direction, so investigation into the font scaling algorithm is needed.