XWayland is the bridging mechanism between legacy Xorg programs and Wayland
compositors.

## HiDPI XWayland

Currently XWayland on HiDPI screens looks pixelated/blurry, due to Xorg's
inability to scale.
There are attempts to add a standard scaling mechanism, such as [MR 733](https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/733).

You can use this MR's wlroots implementation in Hyprland by making a few changes.
{{< hint >}}
The following instructions assume you know how to patch programs, either
manually or using your favourite package manager.

See instructions for [manual patching](https://www.howtogeek.com/415442/how-to-apply-a-patch-to-a-file-and-create-patches-in-linux/)
and [Pacman patching](https://wiki.archlinux.org/title/Patching_packages).
{{< /hint >}}

1. Have the latest `xwayland` package patched with at least
    [the HiDPI patch](https://github.com/hyprwm/Hyprland/blob/main/nix/xwayland-hidpi.patch)
    (based on the MR's implementation, but updated).

2. Make sure you have the required Hyprland `wlroots`, patched with
    [the HiDPI xwayland patch](https://gitlab.freedesktop.org/lilydjwg/wlroots/-/commit/6c5ffcd1fee9e44780a6a8792f74ecfbe24a1ca7)
    and [this commit](https://gitlab.freedesktop.org/wlroots/wlroots/-/commit/18595000f3a21502fd60bf213122859cc348f9af)
    **reverted**. This is important, as not reverting it will make opening XWayland
    programs crash Hyprland.

3. Add this line to your configuration:

    ```ini
    exec-once=xprop -root -f _XWAYLAND_GLOBAL_OUTPUT_SCALE 32c -set _XWAYLAND_GLOBAL_OUTPUT_SCALE 2
    ```

    and configure toolkits to scale using their specific mechanisms, such as

    ```sh
    export GDK_SCALE=2
    export XCURSOR_SIZE=32
    ```

    {{< hint >}}
    The GDK_SCALE variable won't conflict with wayland-native GTK programs.
    {{< /hint >}}