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Configuring: add XWayland page

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Mihai Fufezan 2022-08-29 20:27:32 +03:00
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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:
```toml
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 >}}