slint-ui/slint

Slint/Slint-build enables too much dependencies

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#11554 opened on Apr 28, 2026

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Description

Bug Description

I'm trying to create a minimal Slint setup that compiles as fast as possible.

I noticed that the default Slint build enables almost all features of image-rs, which adds unnecessary overhead to both compile time and binary size.

Removing slint-build helps a lot, because this package pulls in the default image features.

This decreased size of Cargo.lock from 6250 lines to 5685

I think there should be a way to disable these features - I don’t need support for formats like QOI or GIF from image-rs.

It’s also possible that there are additional components that could be made optional, such as resvg, to further improve the build process.

Reproducible Code (if applicable)

Empty project with this Cargo.toml


[dependencies]
slint = "1.16.1"

[build-dependencies]
slint-build = "1.16.1"

Environment Details

  • Slint Version: 1.16
  • Platform/OS: Ubuntu 24.04
  • Programming Language: Rust
  • Backend/Renderer: N/A

Product Impact

No response

Contributor guide

Tech stack
rust
Domain
build systemperformance
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.
1-3 hours
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
Rust and Cargo basicsFeature flag concepts
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60
Research direction
Examine the slint build crate's Cargo.toml (likely at crates/slint build/Cargo.toml) to identify the image rs dependency and its default features. Propose adding a feature flag, such as 'default png', to disable unnecessary image formats like QOI and GIF. Also investigate making resvg optional. Reference issue #11554 for the user's specific request.