PATCH: Double buffering and other cosmetic fixes

[Michael Biebl]

Valentine Sinitsyn wrote:
> Hi Michael, hi, all,
> 
> MB> I maintain the Debian package of knetworkmanager and received a bug
> MB> report today regarding this patch. It seems to cause problems [1].
> 
> MB> I can reproduce this bug in a way:
> MB> When I resume from suspend to ram, and if I use kscreensaver I get the
> MB> exact same behaviour (see the attached screenshot). It seems, that under
> MB> certain circumstances, the wrong background color is chosen. I'm not
> MB> sure if in my case it is because kscreensaver blanks the screen and so
> MB> knetworkmanager picks black as bg color.
> MB> Any ideas how to solve this problem? How do other systray applet handle
> MB> this?
> We've discussed this issue with Timo a while ago - maybe somewhere in
> August when we were considering double buffering patch for inclusion
> to the KNetworkManager SVN. The problem is (to the best of my
> knowledge) X11 doesn't allow one to retrieve the background from the
> underlying window - only grab pixels from screen. This mean that, if
> the window we are interested in (KnetworkManager icon) is obscured, we
> get wrong pixels - one can also observe similar effect in KDE when menu
> shadows are enabled. KNM does its best to avoid this situation (before
> pixels are grabbed, we call erase() to clear the area) but this
> doesn't always help. In the recent KNM release (0.1), double buffering
> is used only when connecting to network, so the background will be
> alright again when the user will connect.
> 
> If you have some ideas on how to avoid this bug completely, I'll be
> very glad to hear it.

I asked the same question on kde-devel, and they recommended to use a
pixmap without a background and an alpha channel instead.
Maybe that is the way to go.

Cheers,
Michael

-- 
Why is it that all of the instruments seeking intelligent life in the
universe are pointed away from Earth?

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