TODO

# Possible performance optimizations

* Use getShmImage extension for X11 server.
* TODO: Use double buffering when creating the texture, s.t. we do not
  need to wait for OpenGL to finish drawing a frame before updating to
  a new one?
  Fetch xImage in separate thread -> push into pipeline for main
  thread with ptr to preexisting texture?
* Use compositeoverlaywindow for masking:
   Window overlay_window = XCompositeGetOverlayWindow(display, root);
   Make GLFW Window with proper size and location child of overlay_window
   via reparenting.
   DONE?!
    -- overlay <- xCompositeGetOverlayWindow dp root
    -- xCompositeRedirectWindow dp w CompositeRedirectAutomatic
    -- mapWindow dp overlay
    -- reparentWindow dp meW overlay 0 0
* Use compositor instead of GLFW workaround...
    -- set_override_redirect ptr True
    -- changeWindowAttributes dp meW cWOverrideRedirect ptr
* TODO: Gif loader performance optimization.
* TODO: Proper logging interface abstraction instead of `print`.

# Notes
* NOTE: Need to set the events we are interested in ON the window we are
  listening on!
* NOTE: A RUNNING compositemanager is ALSO required! MAYBE?
* zPixmap required!
  https://stackoverflow.com/questions/34662275/xgetimage-takes-a-lot-of-time-to-run

# Features
* Toggle ClearScreen (background)
* Zoom monitor away
* Gradually increase visual screen shaking
* Flip screen (X and/or Y)
* Rollercoaster: Move screen and add delayed camera tracking
* Spawn GIF (+optional add sound) at random location for ~X seconds
* Your Highness, texture shader randomizing colors
* FLASHBANG