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When a renderer switch happens, it is possible that when the surface state is created, a buffer for the given surface is already available. In that case, run the attach routine so that the pixel contents are properly set. Otherwise, it would only be set when a new attach request is made for that surface. Also, change the drm backend so that it keeps the buffer reference in the weston_surface when running with the pixman renderer. The pixman renderer keeps a reference to it anyway, so it is never released early. This makes the renderer transition seamless, without leaving a black screen as before.
Weston Weston is the reference implementation of a Wayland compositor, and a useful compositor in its own right. Weston has various backends that lets it run on Linux kernel modesetting and evdev input as well as under X11. Weston ships with a few example clients, from simple clients that demonstrate certain aspects of the protocol to more complete clients and a simplistic toolkit. There is also a quite capable terminal emulator (weston-terminal) and an toy/example desktop shell. Finally, weston also provides integration with the Xorg server and can pull X clients into the Wayland desktop and act as a X window manager. Refer to http://wayland.freedesktop.org/building.html for buiding weston and its dependencies.