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It may happen that you e.g. fullscreen a 800x600 surface with buffer_scale 1 (e.g. a 800x600 buffer) on an output that is otherwise scale 2. In this case we want to temporarily set the output scale to 1, as we're really scanning out of a scale 1 buffer. This causes us to e.g. report the input positions in the right place, etc. When we restore the original mode we also restore the original scale. Note that the scale change is a purely compositor internal change, to clients it still looks like the output is scale 2.
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.