how to get surface screen-shot in spice-server

[hshsh <franklee1973@xxxxxxx>]

Hi, spice gurus:
   I am a spice developer in my company which devle with desktop cloud computing.
   In spice-0.12.4 we can get surface screen-shot in red_worker.c by adding this line in red_process_commands():
       surface_flush(worker, surface_id, &rect);
   Function surface_flush flush undraw image to surface, then we get the screen-shot by reading surface address.
  
   But in spice-0.14.3 we can not get proper screen-shot, by adding this line in red_process_display():
             display_channel_current_flush(worker->display_channel, surface_id);
   We get screen-shot that flicker with white bars, I do not know why.
  
   Much appreciation for any reply!

regards
Frank

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