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The old code had an off-by-one error on the y coordinate where it says height - (cur_y - y). And it does the vflipping of the *destination* buffer, whereas what is really needed is to vflip the whole source buffer. This only affects when you read out part of the image, such as when using the screen recoder. Also, instead of doing the flipping manually we just let pixman handle it.
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.