Stage 21 — Application Window Opacity

What it is. 0xin can apply a configurable opacity to ordinary XDG application windows, allowing its built-in wallpaper or solid background to show through.

Gate: With window_opacity = 0.8, application windows render translucently while compositor backgrounds and layer-shell UI remain fully opaque. With no setting, behavior is unchanged.

Configuration

window_opacity = 0.8

The accepted range is 0.0 through 1.0: 0.0 is fully transparent and 1.0 is fully opaque. The default is 1.0, so existing desktop and device profiles do not become translucent unless they opt in. Invalid values are warned about and ignored.

The FP5 reference profile uses 0.8. The option itself is device-independent and works for the same XDG windows on desktop and mobile backends.

Rendering scope

The compositor walks the buffers below each XDG toplevel scene tree and sets their wlroots scene-buffer opacity. It reapplies the value as surfaces commit and map so buffers that are attached after scene-tree creation receive the same opacity.

This first implementation intentionally excludes layer-shell surfaces. Panels, Patin, virtual keyboards, and similar shell UI therefore remain fully opaque. The compositor-owned solid background and wallpaper are also unaffected.

Opacity is currently a single global startup setting. Per-application rules and live changes can build on this mechanism later.