[gnome-boxes] vm-configurator: Disable SPICE image compression

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit 8a24b9d25aa286f0a57ec6dd0accece3a82408cd
Author: Zeeshan Ali (Khattak) <zeeshanak gnome org>
Date:   Sat Mar 9 16:45:59 2013 +0200

    vm-configurator: Disable SPICE image compression
    
    Since the VMs we create are by default local-only and SPICE server is
    tied to localhost, it makes a lot of sense to disable image compression
    as that wastes a lot CPU/battery for no good reason.
    
    This patch makes gnome-shell's animations inside VM a lot more smooth. On
    my system, it actually now feels very much native.
    
    Alex pointed out that doing this implies disabling streaming as well,
    which is not a problem on its own and we probably should be disabling
    that explicitly as well but unfortunately streaming is required for
    lipsync in SPICE.
    
    However, in practice I see no evidence of lipsync happening anyways. I
    tested this by playing a high definition (1920x1080) video[1] in
    fullscreen on different guest OSs (Fedora, Ubuntu, Windows XP and
    Windows 7) with and without SPICE compression enabled. On all OSs except
    for Ubuntu, I actually saw improvements in video playback performance,
    even w.r.t lipsync with compression disabled. On Ubuntu, there were just
    no significant difference for some reason.
    
    Ideally SPICE should probably itself take care of disabling compression
    for local-only case[2] and decouple streaming from image compression[3]
    but for now its probably a good idea to disable compression ourselves.
    
    [1] http://www.bigbuckbunny.org/index.php/download/
    [2] https://bugs.freedesktop.org/show_bug.cgi?id=62188
    [3] https://bugs.freedesktop.org/show_bug.cgi?id=62187
    
    https://bugzilla.gnome.org/show_bug.cgi?id=695492

 src/vm-configurator.vala |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/vm-configurator.vala b/src/vm-configurator.vala
index 6ab335b..8e8cc67 100644
--- a/src/vm-configurator.vala
+++ b/src/vm-configurator.vala
@@ -65,6 +65,7 @@ private class Boxes.VMConfigurator {
 
         var graphics = new DomainGraphicsSpice ();
         graphics.set_autoport (true);
+        graphics.set_image_compression (DomainGraphicsSpiceImageCompression.OFF);
         domain.add_device (graphics);
 
         // SPICE agent channel. This is needed for features like copy&paste between host and guest etc to 
work.