Re: FVWM: Get the current content of root window

On Thu, Feb 18, 2021 at 02:00:44PM +0100, Klaus Ethgen wrote:
> Hi Dominik,
>
> Am Do den 18. Feb 2021 um 12:36 schrieb Dominik Vogt:
> > On Wed, Feb 17, 2021 at 06:48:45PM +0100, Klaus Ethgen wrote:
> > > seting the background (root window) to some image is easy. But is there
> > > any way to get the image content on fvwm root window back to an image?
> >
> > As far as I know the X protocol offers no way to retrieve the
> > background pixmap of any window.
>
> Sad. How are window manager working when they provide transparency? How
> does ETerm does it? (however, it doesn't work here)

They tell the X server to do it, mostly by doing alpha blending, I
think.  X offers no reliable way to get any screen contents other
than what you can see.  Doing that on the client is also really
too slow.

Ciao

Dominik ^_^  ^_^

--

Dominik Vogt