True 10bit support

[breadnone]

Is there a way to have WPF supports 10 bit color space?
HDR capable displays are quite common nowadays, and surely wpf dont support that out of the box let alone 10bit color space.

My solution at the moment is using direct composition on top of wpf with manual z depth handling and positioning sadly its prone to screen tearing without keyedmutex synchronization and surely its a hack.

to those curious what is direct composition about, its the same trick used by PDN(paint dot net)

[miloush]

not with DX9, duplicate of #10748