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Another tricky feature, rounded corners! Took several days, but I believe I've got a pretty complete implementation.

You (manually) set the window corner radius and whether to force-clip the window. You can set radius per-corner to match GTK 3 apps. It works correctly with subsurfaces, blocked-out windows, transparency, gradient borders, resize and other animations.

Optimization-wise, opaque regions and even overlay plane unredirection work where possible!

#niri #smithay