[mrmcq2u]

Great thing to see being worked on. Out of curiosity does any of Moz2D's back-ends support stencil then cover approach to rendering on the gpu.

http://on-demand.gputechconf.com/gtc/2012/presentations/S002...

At first I thought it might be a good idea to implement a gallium statetracker for such a framework but with the direct3d statetracker not being supported by projects like wine I thought maybe vulkan will open up an opportunity to implement something with similar performance which is driver,vendor and platform agnostic.

[pcwalton]

I think Skia-GL might (and who knows what Direct2D does).

Note that one of the biggest benefits of WebRender is that it doesn't need to do any of that: if you render CSS directly, you can avoid all of these complex path rendering techniques.