<div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">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.</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">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.</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">Cheers,</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">Olivier</div></div><div class="gmail_extra"><br><div class="gmail_quote">On 18 November 2015 at 11:57, John Found <span dir="ltr"><<a href="mailto:johnfound@asm32.info" target="_blank">johnfound@asm32.info</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">On Wed, 18 Nov 2015 10:47:28 +0100<br>
Olivier Fourdan <<a href="mailto:fourdan@gmail.com">fourdan@gmail.com</a>> wrote:<br>
<br>
> Perfectly normal, if you use ARGB windows, xfwm4 compositor won't apply<br>
> shadows to your window because it doesn "know" the actual shape of the<br>
> content (being ARGB).<br>
><br>
<br>
</span>Oh, I see. But actually the compositor knows the shape - it is the alpha channel.<br>
<br>
Best Regards<br>
<div class="HOEnZb"><div class="h5">--<br>
<a href="http://fresh.flatassembler.net" rel="noreferrer" target="_blank">http://fresh.flatassembler.net</a><br>
<a href="http://asm32.info" rel="noreferrer" target="_blank">http://asm32.info</a><br>
John Found <<a href="mailto:johnfound@asm32.info">johnfound@asm32.info</a>><br>
_______________________________________________<br>
Xfce4-dev mailing list<br>
<a href="mailto:Xfce4-dev@xfce.org">Xfce4-dev@xfce.org</a><br>
<a href="https://mail.xfce.org/mailman/listinfo/xfce4-dev" rel="noreferrer" target="_blank">https://mail.xfce.org/mailman/listinfo/xfce4-dev</a><br>
</div></div></blockquote></div><br></div>