[Spice-devel] A question about QXL

[Van Yu]

Hi experts,

  Recently I’m studying QXL XDDM driver to see how the display are accelerated.

  One thing I do not understand is that I thought some updates should be missing on clients.
  Say in the implementation of DrvBitBlt function, if it is not supported. the implemention will punt to EngBitBlt.

  However, in such case, no QXL command is pushed to cmd ring. So how does spice client notice the frame buffer change 
made by EngBitBlt?

  Can anyone help provide guidance on this?

  Thanks.