ScreenFX

FXMode which captures the screen and maps zones in it to LED strips.

Compatibility

In theory, everything supported by MSS should work. I only tested Linux wih X11 though.

Since this comes as a submodule for ImmersiveFX already, follow the installation steps over there to get it working. ^^

additionally to the config done in the ImmersiveFX README, the following keys can be set in config.json:

screenfx_preset can be either low, medium or high. Higher values capture more area but are more expensive to calculate. Defaults to medium. Only affects the provided cutouts below.
screenfx_monitor pre-define used monitor for mss. Available options are shown at startup for selection if not or wrongly set. The expected value is 0 or bigger.
screenfx_video_device pre-define video device. Available options are shown at startup for selection if not or wrongly set. The expected value is 0 or bigger.

Additionally per device object, the following key must be set:

cutout the area of the screen mapped to the device, can be one of the following: left, right, bottom, top, which represent the according screen border.

ScreenFX (Video Capture) can be used to process Wayland screens. This needs some preparation though:

install v4l2loopback. The package name for Arch Linux is v4l2loopback-dkms
run sudo modprobe v4l2loopback
- hint: to persist it, create a file /etc/modules-load.d/v4l2loopback.conf with the content v4l2loopback
install obs-studio and run it
You should be able to add a capture source named something like Screen Capture (PipeWire)
(optional) In the bottom right corner under Settings > Video, you can scale down the output resolution which can greatly improve performance
In the bottom left corner you can start the virtual webcam which is then available to ScreenFX (Video Device)