overthinkos/wl-overlay-layer
selkies/skills/wl-overlay-layer/SKILL.md
Wayland overlay windows via gtk4-layer-shell (for screen recordings). Use when working with the wl-overlay candy, gtk4-layer-shell, or overlay dependencies.
testing
Updated Jun 12, 2026
$ install --global
skillsauthnpx skillsauth add overthinkos/overthink-plugins wl-overlay-layerInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
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Last scanned: Jun 12, 2026, 6:51 AM42.7s1 file scanned
SKILL.md
- name:
- wl-overlay-layer
- description:
- |
wl-overlay -- Wayland overlay windows via gtk4-layer-shell
Candy Properties
| Property | Value |
|----------|-------|
| Dependencies | dbus |
| Install files | task:, charly-overlay |
Packages
gtk4(RPM)gtk4-layer-shell(RPM) — includesGtk4LayerShell-1.0.typelibfor GObject Introspectionpython3-gobject(RPM)
Technical Details
Python Script: charly-overlay
Installed to ~/.local/bin/charly-overlay via task:. Dual-mode script (daemon + client) using GTK4 + gtk4-layer-shell for layer-shell protocol overlays.
Key implementation details:
- Shebang:
#!/usr/bin/python3(system Python 3.14, NOT pixi's Python — PyGObject is an RPM package) - Library preload:
CDLL("libgtk4-layer-shell.so.0")must load before GTK4 import (registers layer-shell protocol before Wayland display init). Uses versioned soname.so.0(unversioned.sois in-develpackage only) - RGBA surfaces:
window { background: none; }CSS applied globally at daemon startup. Without this, GTK4 on Wayland creates opaque surfaces that don't support alpha transparency - Cairo backgrounds: all overlay backgrounds drawn via
Gtk.DrawingArea+ Cairopaint(). GTK4 CSSbackground-colorwithrgba()does not composite correctly on layer-shell windows - Thread safety: socket listener runs in a separate thread; all GTK operations dispatched via
GLib.idle_add() - IPC: Unix domain socket at
/tmp/charly-overlay.sockwith JSON-line protocol
Layer-Shell Configuration
- Layer:
OVERLAY(above TOP where waybar/swaync live) - Keyboard mode:
NONE(overlays never capture input) - Exclusive zone:
-1(don't push other windows) - Namespace:
charly-overlay-<name>per overlay window
Usage
# charly.yml — typically included via desktop metalayers
# Already part of sway-desktop, selkies-desktop
my-desktop:
candy:
- wl-overlay
charly eval wl overlay show my-image --type text --text "Hello" --name intro
charly eval wl overlay list my-image
charly eval wl overlay hide my-image --all
Used In
/charly-selkies:sway-desktop— sway desktop composition/charly-selkies:selkies-desktop-layer— selkies streaming desktop composition
Used In Boxes
/charly-selkies:sway-browser-vnc(viasway-desktopmetalayer)/charly-selkies:selkies-labwc(viaselkies-desktopmetalayer)/charly-selkies:selkies-labwc-nvidia(viaselkies-desktopmetalayer)
Related Candies
/charly-infrastructure:dbus-layer— D-Bus session bus (dependency, required by GTK4)/charly-selkies:wl-tools— Wayland automation tools (sibling in desktop stack)/charly-selkies:a11y-tools— also usespython3-gobject(RPM deduplication handles overlap)/charly-infrastructure:tmux-layer— tmux (required for overlay daemon hosting)
Related Commands
/charly-eval:wl-overlay— Overlay command usage, types, recording workflow/charly-eval:wl— Compositor-agnostic desktop automation/charly-eval:record— Recording commands (overlays compose with recording)
Related
/charly-image:layer— candy authoring reference (charly.ymlschema, task verbs, service declarations)/charly-eval:eval— declarative testing (eval:block,charly eval box,charly eval live)
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