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This way we map the surface if it currently isn't mapped and avoid duplicating some of the code already in pointer_cursor_surface_configure(). Without this, the cursor code relied on a wl_surface.attach() to show the new pointer surface. If we're not changing the cursor buffer, we don't get that, but we still need to map the cursor.
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.