rmader, 2 months ago

If you run Gnome, you can enable the opaque region overlay, which draws green or purple overlays over the content whenever Mutter is compositing - and shows the content normally when doing direct-scanount / zero-copy.

You can enable it via alt+f2 -> "lg" -> "Flags" -> OPAQUE_REGION

When things work correctly, you should get a purple overlay when in windowed mode or player controls are visible - and a normal image when fullscreen without controls.

Livi in fullscreen mode, playing a video. No player elements are visible and there's neither a green or purple overlay over the image.
Livi in fullscreen mode, playing a video. Some player elements over the video are visible and the whole image is slighly green from the opaque overlay.
Livi in fullscreen mode, playing a video. Some player elements over the video are visible and there is neither a green or puprle overlay.