What windows are "popup windows"?

Olivier Fourdan fourdan at gmail.com
Wed Nov 18 15:01:03 CET 2015

No it doesn't really, the alpha channel is not just opaque/transparent,
it's a whole range of transparency. Only thing that /could/ give a hint is
the input shape, if used. But then it would be just daft and break in many
different common use cases.

If your app uses an alpha channel, it ought to draw its shadows itself the
way it wants (like CSD windows with gtk+). Applying shadows on top of CSD
GTK CSD windows for example would look dreadful.


On 18 November 2015 at 11:57, John Found <johnfound at asm32.info> wrote:

> On Wed, 18 Nov 2015 10:47:28 +0100
> Olivier Fourdan <fourdan at gmail.com> wrote:
> > Perfectly normal, if you use ARGB windows, xfwm4 compositor won't apply
> > shadows to your window because it doesn "know" the actual shape of the
> > content (being ARGB).
> >
> Oh, I see. But actually the compositor knows the shape - it is the alpha
> channel.
> Best Regards
> --
> http://fresh.flatassembler.net
> http://asm32.info
> John Found <johnfound at asm32.info>
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