Question

Is it possible in python to tell if a full screen application on linux is running?
I have a feeling it might be possible using Xlib but I haven’t found a way.

EDIT: By full screen I mean the WHOLE screen nothing else but the application, such as a full-screen game.

Answer 1

Found a solution:

import Xlib.display

screen = Xlib.display.Display().screen()
root_win = screen.root

num_of_fs = 0
for window in root_win.query_tree()._data['children']:
    window_name = window.get_wm_name()
    width = window.get_geometry()._data["width"]
    height = window.get_geometry()._data["height"]

    if width == screen.width_in_pixels and height == screen.height_in_pixels:
        num_of_fs += 1

print num_of_fs

This prints out the number of fullscreen windows which for me is normally one. When playing a full screen game its 2.