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Hi,
if you want to make a ARGB window using xlib/Qt here is the code i use
/**files to include from xlib*/
#include <X11/extensions/Xrender.h>
#include <X11/Xlib.h>

/**getting display*/
Display *dpy =3D XOpenDisplay ( 0 ); // open default display
    if ( !dpy ) {
        qWarning ( "Cannot connect to the X server" );
        exit ( 1 );
    }

/**code for argb visual*/
    bool  argbVisual=3Dfalse;
    int screen =3D DefaultScreen ( dpy );
    Colormap colormap =3D 0;
    Visual *visual =3D 0;
    int eventBase, errorBase;

    if ( XRenderQueryExtension ( dpy, &eventBase, &errorBase ) ) {
        qWarning ("You have ARGB support");
        int nvi;
        XVisualInfo templ;
        templ.screen  =3D screen;
        templ.depth   =3D 32;
        templ.c_class =3D TrueColor;
        XVisualInfo *xvi =3D XGetVisualInfo ( dpy, VisualScreenMask |
                                            VisualDepthMask |
                                            VisualClassMask, &templ, &nvi )=
;

        for ( int i =3D 0; i < nvi; ++i ) {
            XRenderPictFormat *format =3D XRenderFindVisualFormat ( dpy,
                                        xvi[i].visual );
            if ( format->type =3D=3D PictTypeDirect && format->direct.alpha=
Mask
) {
                visual =3D xvi[i].visual;
                colormap =3D XCreateColormap ( dpy, RootWindow ( dpy, scree=
n
),
                                             visual, AllocNone );
                argbVisual=3Dtrue;
                break;
            }
        }
    }
    /**end of code for argb visual*/

then QApplication app (dpy, argc, argv,Qt::HANDLE ( visual ), Qt::HANDLE (
colormap ) );



On Thu, May 14, 2009 at 6:24 PM, Thomas L=FCbking <thomas.luebking@web.de>w=
rote:

> Am Thursday 14 May 2009 schrieb Harald Hvaal:
>
>
> > Do I need to write graphics routines through kwin plugin framework? Is
> if you want an effect on desktops/windows (like the cube switch etc.)
> that's likely the best location
>
>
> > there a flag in Qt that I can use to get an alpha blended backgroudn fo=
r
> a
> > qmainwindow?
> Qt 4.5 (only on window type widgets QWidget::isWindow())
> QWidget::setAttribute(Qt::WA_TranslucentBackground)
> this will however (obviously) only work on composited desktops
>
>
> > Maybe plasma has something for this? Is it even possible?
> if you want whatever you want on the desktop layer (i.e. below all normal
> windows), you can make a plasmoid (QGraphicsViewItem) and just use alpha
> blending
>
>
> Thomas
>
>
>
>
>
> >> Visit http://mail.kde.org/mailman/listinfo/kde-devel#unsub to
> unsubscribe <<
>
>


--=20
Regards:
Shashank Singh
Associate - Software | New Technologies team
Geodesic Limited |  <http://www.geodesic.com>
Tel: +91 22 2831 2872

Blog:http://techfreaks4u.com/blog
Marble contributor : http://edu.kde.org/marble/
KDE-in Volunteer : http://www.kde.in/

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Hi,<br>if you want to make a ARGB window using xlib/Qt here is the code i u=
se<br>/**files to include from xlib*/<br>#include &lt;X11/extensions/Xrende=
r.h&gt;<br>#include &lt;X11/Xlib.h&gt;<br>=A0=A0=A0 <br>/**getting display*=
/<br>

Display *dpy =3D XOpenDisplay ( 0 ); // open default display<br>=A0=A0=A0 i=
f ( !dpy ) {<br>=A0=A0=A0=A0=A0=A0=A0 qWarning ( &quot;Cannot connect to th=
e X server&quot; );<br>=A0=A0=A0=A0=A0=A0=A0 exit ( 1 );<br>=A0=A0=A0 }<br>=
<br>/**code for argb visual*/<br>=A0=A0=A0 bool=A0 argbVisual=3Dfalse;<br>

=A0=A0=A0 int screen =3D DefaultScreen ( dpy );<br>=A0=A0=A0 Colormap color=
map =3D 0;<br>=A0=A0=A0 Visual *visual =3D 0;<br>=A0=A0=A0 int eventBase, e=
rrorBase;<br><br>=A0=A0=A0 if ( XRenderQueryExtension ( dpy, &amp;eventBase=
, &amp;errorBase ) ) {<br>=A0=A0=A0=A0=A0=A0=A0 qWarning (&quot;You have AR=
GB support&quot;);<br>

=A0=A0=A0=A0=A0=A0=A0 int nvi;<br>=A0=A0=A0=A0=A0=A0=A0 XVisualInfo templ;<=
br>=A0=A0=A0=A0=A0=A0=A0 templ.screen=A0 =3D screen;<br>=A0=A0=A0=A0=A0=A0=
=A0 templ.depth=A0=A0 =3D 32;<br>=A0=A0=A0=A0=A0=A0=A0 templ.c_class =3D Tr=
ueColor;<br>=A0=A0=A0=A0=A0=A0=A0 XVisualInfo *xvi =3D XGetVisualInfo ( dpy=
, VisualScreenMask |<br>

=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 VisualDepthMask |<br=
>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 VisualClassMask, =
&amp;templ, &amp;nvi );<br><br>=A0=A0=A0=A0=A0=A0=A0 for ( int i =3D 0; i &=
lt; nvi; ++i ) {<br>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 XRenderPictFormat *fo=
rmat =3D XRenderFindVisualFormat ( dpy,<br>

=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 xvi[i].visual );<br>=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0 if ( format-&gt;type =3D=3D PictTypeDirect &amp;&amp;=
 format-&gt;direct.alphaMask ) {<br>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0 visual =3D xvi[i].visual;<br>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0 colormap =3D XCreateColormap ( dpy, RootWindow ( dpy, screen ),<br>

=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 visual, AllocNone=
 );<br>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 argbVisual=3Dtrue;<br>=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 break;<br>=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0 }<br>=A0=A0=A0=A0=A0=A0=A0 }<br>=A0=A0=A0 }<br>=A0=A0=A0 /*=
*end of code for argb visual*/<br><br>then QApplication app (dpy, argc, arg=
v,Qt::HANDLE ( visual ), Qt::HANDLE ( colormap ) );<br>

<br><br><br><div class=3D"gmail_quote">On Thu, May 14, 2009 at 6:24 PM, Tho=
mas L=FCbking <span dir=3D"ltr">&lt;<a href=3D"mailto:thomas.luebking@web.d=
e">thomas.luebking@web.de</a>&gt;</span> wrote:<br><blockquote class=3D"gma=
il_quote" style=3D"border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0=
pt 0pt 0.8ex; padding-left: 1ex;">

<div style=3D"font-family: &#39;Segoe&#39;; font-size: 10pt; font-weight: 4=
00; font-style: normal;">Am Thursday 14 May 2009 schrieb Harald Hvaal:<div =
class=3D"im"><br>
<p style=3D"margin: 0px; text-indent: 0px;"><br></p>&gt; Do I need to write=
 graphics routines through kwin plugin framework? Is<br></div>
if you want an effect on desktops/windows (like the cube switch etc.) that&=
#39;s likely the best location<div class=3D"im"><br>
<p style=3D"margin: 0px; text-indent: 0px;"><br></p>&gt; there a flag in Qt=
 that I can use to get an alpha blended backgroudn for a<br>
&gt; qmainwindow? <br></div>
Qt 4.5 (only on window type widgets QWidget::isWindow())<br>
QWidget::setAttribute(Qt::WA_TranslucentBackground)<br>
this will however (obviously) only work on composited desktops<div class=3D=
"im"><br>
<p style=3D"margin: 0px; text-indent: 0px;"><br></p>&gt; Maybe plasma has s=
omething for this? Is it even possible?<br></div>
if you want whatever you want on the desktop layer (i.e. below all normal w=
indows), you can make a plasmoid (QGraphicsViewItem) and just use alpha ble=
nding<br><font color=3D"#888888">
<p style=3D"margin: 0px; text-indent: 0px;"><br></p>Thomas<br>
<p style=3D"margin: 0px; text-indent: 0px;"><br></p><p style=3D"margin: 0px=
; text-indent: 0px;"><br></p></font></div><br><br>
&gt;&gt; Visit <a href=3D"http://mail.kde.org/mailman/listinfo/kde-devel#un=
sub" target=3D"_blank">http://mail.kde.org/mailman/listinfo/kde-devel#unsub=
</a> to unsubscribe &lt;&lt;<br>
<br></blockquote></div><br><br clear=3D"all"><br>-- <br>Regards:<br>Shashan=
k Singh<br>Associate - Software | New Technologies team<br>Geodesic Limited=
 | =A0&lt;<a href=3D"http://www.geodesic.com">http://www.geodesic.com</a>&g=
t; <br>

Tel: +91 22 2831 2872 <br><br>Blog:<a href=3D"http://techfreaks4u.com/blog"=
>http://techfreaks4u.com/blog</a><br>Marble contributor : <a href=3D"http:/=
/edu.kde.org/marble/">http://edu.kde.org/marble/</a><br>KDE-in Volunteer : =
<a href=3D"http://www.kde.in/">http://www.kde.in/</a><br>



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