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`enboxer` with no command opens File/Session/Video/Maps. Native Wayland clients get a brief focus steal; XWayland/Wine stays unfocused.
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Live crop (Video FX)
You pick two rectangles:
- Source — which part of another client to copy, and how large that crop is.
- Viewer — where that crop is drawn on the primary client, and how large it is shown.
Numbers 0–1 are fractions of that window. Numbers greater than 1 are pixels inside the window. In the GUI, Pick source / Pick viewer uses slurp and stores pixels.
When the mouse is over the viewer, clicks and keys go only to the source client, not to the primary and not to the rest of the team.
Configure this in the Video FX page of the control panel (enboxer with no arguments).
It is not a second monitor and not a window swap. The other client can sit behind the main one; you still see the cropped piece.
What Hyprland can actually do
| Method | Sees a window that is fully covered? | What we use |
|---|---|---|
grim of a screen rectangle |
No — only pixels currently on the output | Yes, today |
hyprland-toplevel-export |
Yes — compositor copy of that window’s buffer | Not wired yet |
| Desktop portal / PipeWire | Yes, heavier | No |
So: keep the source window on a visible output (another monitor, or a slice of the same one). If you stack every client on the same pixels, the crop will show whatever is on top, not the hidden client. Wiring toplevel-export is the next capture step when you want a stacked layout.
The overlay itself is an mpv window (class: enboxer-vfx) that reloads each grim frame.