#1743 HIGH First D: Preview for journal items are not created until the activity is closed.

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#1743: Preview for journal items are not created until the activity is closed.
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  Reporter:  tomeu   |       Owner:  tomeu                 
      Type:  defect  |      Status:  new                   
  Priority:  high    |   Milestone:  First Deployment, V1.0
 Component:  sugar   |     Version:                        
Resolution:          |    Keywords:                        
  Verified:  0       |  
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Comment(by marco):

 Replying to [comment:10 danw]:
 > Heh. I filed that bug against gnome-screenshot a few years ago:
 http://bugzilla.gnome.org/show_bug.cgi?id=121492. From looking at the
 patch there
 (http://bugzilla.gnome.org/attachment.cgi?id=52863&action=view), it seems
 like if you call get_from_drawable() on the root window rather than the
 main activity window, you'll get a correct screenshot.

 The problem with using get_from_drawable directly on the root window is
 that it's too slow (even on a fast laptop it's around 0.3) and need to be
 done while the window is visible. That blocks the UI too much. Also if you
 close a window from the Home view you get the wrong screenshot.

 So the approach we are considering is to XCopyArea all the windows in the
 activity to an offscreen pixmap while the activity is visible (which is
 very fast because it's all done on the server side) and then when the
 window goes in the background call get_from_drawable() on the pixmap (at
 that point it doesn't matter if it's slow and blocks because the process
 is in the background).

 On the longer term we might be able to use the redirection work that is
 being done in gtk, but it's not clear if/when it will be merged:

 http://bugzilla.gnome.org/show_bug.cgi?id=3188

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Ticket URL: <https://dev.laptop.org/ticket/1743#comment:14>
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