Re: [dev] diffdisplays

From: Carlos Torres <>
Date: Tue, 30 Apr 2013 21:54:25 -0400

I'm not an X11 expert, but this sounds like something that XRender and
XDamage could do. i.e. overlay a semi transparent window over a
screen where activity has timed out (?) and capture damage events and
then have those events contribute an alpha channel change. I don't
know whether the damage stuff provides coords, but it should
otherwise how else would xrender know to redraw just those areas
overlayed above...

the timout that causes the window to appear could be short, and its
transparency could be at 100%, getting gradually opaque overtime, and
the damaged areas would shift toward white. upon a focus event or
something of that sort the window would get unmapped.

this doesn't have to be in dwm, i don't think it does anyway.

On Mon, Apr 29, 2013 at 12:34 PM, Christoph Lohmann <> wrote:
> Greetings comrades,
> on my news mailbox something interesting appeared [0]. Applying such a
> »display diff« to a dwm tag would be interesting, to only show the new
> difference from the last time it was switched to that tag. Making it a
> common tool you can use to watch certain displays from one state would
> make it more usable everywhere. The gimmick of the webcam would be some
> eye tracker which does not need to be combined with the display diff.
> Are here any X11 experts that know how this could be implemented?
> Sincerely,
> Christoph Lohmann
> [0]
Received on Wed May 01 2013 - 03:54:25 CEST

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