This functionality was tossed into the trash heap with extreme prejudice with the transition to Wayland (along with other amusingly terrible features, like the ability to use a printer as the display for an OpenGL context), but X11 actually did support arbitrarily shaped windows. This functionality was demonstrated with the novelty application xeyes which created two round windows.
Yooooo where do I get trapezoid windows????
This functionality was tossed into the trash heap with extreme prejudice with the transition to Wayland (along with other amusingly terrible features, like the ability to use a printer as the display for an OpenGL context), but X11 actually did support arbitrarily shaped windows. This functionality was demonstrated with the novelty application xeyes which created two round windows.
sudo apt-get install trapezoid windows :linus: