FreeRDP/FreeRDP — pull request #225 by nfedera (2011-11-25 10:52:46+00:00)
Title: core: add update callback for the surface frame marker command

- clients will need this to present the offscreen to the display
in the correct state in order to avoid flickering and artefacts
and to do frame acknowledgement.

- added empty callback to xfreerdp.