Re: [gtk-vnc-devel] patch to allow use with OS X Screen Sharing

[Anthony Liguori <anthony codemonkey ws>]

Jin Choi wrote:
> On Apr 1, 2008, at 2:58 PM, Daniel P. Berrange wrote:
>   
> > tightvncviewer probably explicitly asks for a reduced colour depth /  
> > pixel
> > format rather than accepting the VNC server's default settings. This  
> > can
> > have a noticable impact over bandwidth limited links
> >
> > Dan.
> >     
>
> That doesn't appear to be what's going on. It is using the default  
> 32bpp format, and a whole-screen load is sub-second with  
> xtightvncviewer. With vinagre, you can see the screen load in strips,  
> the whole screen load takes about 10 seconds or so. Window moves lag  
> about five seconds, whereas with tightvnc there is sub-second lag.
>   

The only possibility would be that tightvnc is using the tight encoding 
with lossy jpeg compression.  Depending on what your background was, 
this could make a very big difference in compression.  Please try 
gvncviewer with the following patch and let me know if it helps.  Try 
adjusting the '5' from 1 to 9 and see if how much of a difference that 
makes.

diff -r 7fd767383ac8 examples/gvncviewer.c
--- a/examples/gvncviewer.c    Wed Mar 19 09:43:33 2008 -0500
+++ b/examples/gvncviewer.c    Tue Apr 01 19:23:29 2008 -0500
@@ -348,6 +348,7 @@ int main(int argc, char **argv)
    vnc_display_set_keyboard_grab(VNC_DISPLAY(vnc), TRUE);
    vnc_display_set_pointer_grab(VNC_DISPLAY(vnc), TRUE);
    //vnc_display_set_pointer_local(VNC_DISPLAY(vnc), TRUE);
+    vnc_display_set_lossy_encoding(VNC_DISPLAY, 5);

    gtk_signal_connect(GTK_OBJECT(window), "delete-event",
               GTK_SIGNAL_FUNC(gtk_main_quit), NULL);


Regards,

Anthony Liguori

> It does report that it is "Using shared memory PutImage". Would this  
> make a difference?
>
>
>
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