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greetd-moongreet/DECISIONS.md
nevaforget 293bba32a6 feat: add optional background blur via image crate 
Gaussian blur applied at texture load time when `background-blur` is
set in the [appearance] section of moongreet.toml. Blur runs once,
result is shared across monitors.
2026-03-28 14:53:16 +01:00

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Decisions

2026-03-28 – Optional background blur via image crate

  • Who: Selene, Dom
  • Why: Blurred wallpaper as greeter background is a common UX pattern for login screens
  • Tradeoffs: Adds image crate dependency (~15 transitive crates); CPU-side Gaussian blur at load time adds startup latency proportional to image size and sigma. Acceptable because blur runs once and the texture is shared across monitors.
  • How: load_background_texture(bg_path, blur_radius) loads texture, optionally applies imageops::blur(), returns blurred gdk::Texture. Config option background-blur: Option<f32> in [appearance] TOML section.

2026-03-28 – Audit fixes for shared wallpaper texture (v0.4.1)

  • Who: Selene, Dominik
  • Why: Quality, performance, and security audits flagged issues in load_background_texture(), debug logging, and greetd error handling
  • Tradeoffs: GResource path now requires UTF-8 (returns None for non-UTF-8 instead of aborting); 50 MB wallpaper limit is generous but prevents OOM; debug logging off by default trades observability for security
  • How: GResource branch via resources_lookup_data() + from_bytes() (no abort), file size limit, error details only at debug level, MOONGREET_DEBUG env var for log level, greetd retry path truncation matching show_greetd_error()