Tiago Vignatti describes the mechanism
by which X clients will be supported on a Wayland display server. "All X windows created from now on will be redirected to offscreen pixmap and stored on a DRM buffer (via the xwayland video driver); that’s how compositing works on Wayland. The idea is that a X client will behave very likely as a regular Wayland client. Therefore, there’s no protocol calls or any major task involved on xwayland and all happens seamlessly, with the protocol 'conversion' penalty close to nil.
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