uxa: PutImage acceleration

Avoid waiting on dirty buffer object by streaming the upload to a fresh,
non-GPU hot buffer and blitting to the destination.

This should help to redress the regression reported in bug 18075:

  [UXA] XPutImage performance regression
  https://bugs.freedesktop.org/show_bug.cgi?id=18075

Using the particular synthetic benchmark in question on a g45:

Before:
   9542.910448 Ops/s; put composition (!); 15x15
   5623.271889 Ops/s; put composition (!); 75x75
   1685.520362 Ops/s; put composition (!); 250x250

After:
  40173.865300 Ops/s; put composition (!); 15x15
  28670.280612 Ops/s; put composition (!); 75x75
   4794.368601 Ops/s; put composition (!); 250x250

which while not stellar performance is at least an improvement. As
anticipated this has little impact on the non-fallback RENDER paths, for
instance the current cairo-xlib backend is unaffected by this change.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

0 files changed, 0 insertions, 0 deletions