xfwm4 compositor and the root pixmap.

[Alistair Buxton]

With compositing window manager the real root window is never visible
because of the offscreen buffer, so the compositor always has to
handle the background.


On 25 November 2013 09:10, Nick Schermer <nick at xfce.org> wrote:
> Haven't tried anything of this, but what if xfwm4 does not touch the bg
> pixmap at all? Is that even possible.
>
> IIRC X preserves the pixmap as well, so why have xfwm4 handle this?
>
> Nick
>
>
> On Fri, Nov 22, 2013 at 9:47 PM, Alistair Buxton <a.j.buxton at gmail.com>
> wrote:
>>
>> When using compositing, xfwm4 fills it's background with solid grey,
>> and then drawing the user's wallpaper is left up to xfdesktop. That's
>> all fine, except that there's a few seconds after xfwm4 starts and
>> before xfdesktop starts where you can see the ugly grey. If your X11
>> login screen already set the user's wallpaper this looks bad, as it
>> goes grey, and then goes back to the correct image.
>>
>> Xfwm4 has some code inside MONITOR_ROOT_PIXMAP defines which is not
>> normally enabled. This does two things: it copies any pixmap it finds
>> at startup, and then it constantly monitors the root for changes.
>>
>> I think it would be a good idea to always copy the root pixmap on
>> startup, to avoid the few seconds of grey, even if MONITOR_ROOT_PIXMAP
>> is not defined. eg:
>>
>>
>> https://github.com/ali1234/xfwm4/commit/b7baa7aa60cdb80759e0872d0ab5a7cb59ec5c10
>>
>> Also, the different atoms used by various software to control the
>> RetainPermanent root pixmaps has many different possible names. Does
>> it make sense to add these? As well as XROOTPMAP and XSETROOT it
>> already checks, there is also _XROOTPMAP_ID and ESETROOT_PMAP_ID which
>> all have exactly the same meaning as far as I can tell. It seems like
>> it would be easy to add these, at least for the initial copy.
>>
>> What do you think about this?
>>
>> --
>> Alistair Buxton
>> a.j.buxton at gmail.com
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>> Xfce4-dev at xfce.org
>> https://mail.xfce.org/mailman/listinfo/xfce4-dev
>
>
>
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-- 
Alistair Buxton
a.j.buxton at gmail.com