It's impossible to create another pipeline with d3dvideosink after disposing
the previous one due to some problem in d3dvideosink. The message is: "Unable
to register Direct3D hidden window class".
I've evaluated the problem and it's that UnregisterClass() in working thread is
called before DestroyWindow() and UnregisterClass() does nothing.
https://bugzilla.gnome.org/show_bug.cgi?id=722622
On a device lost, all the surfaces allocated in the
device need to be released before resetting the device,
which can't be done for the allocated buffers.
https://bugzilla.gnome.org/show_bug.cgi?id=706566
Use the bilinear scalling filter when the magnifier or the minifier
filters are avaible. Some graphics cards do not provide minifier filters
but we want to use it for upscalling if it's available
https://bugzilla.gnome.org/show_bug.cgi?id=697176
And only support color formats that are actually supported by the driver,
this allows proper zero-copy handling later and simplifies the code a lot.
Also simplify some other places, like the format mapping code.
