https://bugs.kde.org/show_bug.cgi?id=361674
--- Comment #9 from mcottr...@teradici.com ---
(In reply to Thomas Lübking from comment #8)
> (In reply to mcottrell from comment #7)
> > from the root window (which I guess is the same as the desktop window?).
>
> Nope. the plasmashell desktop containment is a regular root child (top level
> window) with special tags to be known as "desktop" - you'll however get
> every event on the root window if you listen to child events (didn't check
> your code)
by listen to child events do you mean setting the event mask for every child
window? I tried with xlib and xcb and haven't had any luck finding a way to do
this in any other way, but I could be missing something blindingly obvious...
>
> > I'm trying to accumulate damaged regions so that I can scrape only pixels
> > that have changed, then encode and transmit them over the network to remote
> > the desktop.
>
> Just listen to exposure events in addition - you should not get them while a
> compositor does the screen and even iff, they'll be part of the damage
> events from the compositor scene anyway.
I ran "xwininfo -tree -root" and tried all of the windows that cover the whole
desktop (i.e. window size is 1920x1200):
0x3600019 (has no name): () 1920x1200+0+0 +0+0
1 child:
0x360001a (has no name): () 1920x1200+0+0 +0+0
1 child:
0x3400013 "Desktop — Plasma": ("plasmashell" "plasmashell")
1920x1200+0+0 +0+0
but when running xev on those windows looking at expose events, I'm seeing
nothing when I minimise either a full screen window or a window obscuring part
of the desktop. Is the "Desktop — Plasma" window the one you were referring to
as the one tagged to be known as "desktop"?
thanks for your replies so far.
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