From kde-devel  Wed Jul 21 15:55:01 2010
From: Martin =?iso-8859-15?q?Gr=E4=DFlin?= <kde () martin-graesslin ! com>
Date: Wed, 21 Jul 2010 15:55:01 +0000
To: kde-devel
Subject: Re: Qt XRenderComposite question
Message-Id: <201007211755.09327.kde () martin-graesslin ! com>
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On Wednesday 21 July 2010 09:44:32 Twister Rodriguez wrote:
> Hello,
>=20
> I hope you could help with some code, which uses XRender XComposite and Q=
t.
> The reason I'm asking, is because, I've seen similar code in the KDE
> source, however, I can't make it work. May be you could help.
I cannot be really a help, because I hardly know anything about XRender. Bu=
t=20
at least I can point you to some compositing source code. As you might know=
=20
KWin supports XRender compositing, so you can find some code in=20
trunk/KDE/kdebase/workspace/kwin. Most important:
* scene_xrender.[h|cpp] - here the most important method should be=20
SceneXrender::Window::performPaint
* scene.[h|cpp] - provides some documentation
* lib/kwinxrenderutils.[h|cpp] - provide some functions which are used by=20
scene_xrender=20
* composite.cpp - some basic compositing related stuff

I would also recommend you to have a look on scene_opengl.[h|cpp] and think=
=20
about using OpenGL instead of XRender. In most cases you will achieve bette=
r=20
performance. It might also be easier to just render the window to an OpenGL=
=20
=46ramebuffer object and save that to disk. This could be done by writing a=
 KWin=20
compositing effect - we are interested in that (for interaction with=20
KSnapshot).

=46or more questions I guess the kwin mailinglist might be a better place,

Regards
Martin Gr=E4=DFlin

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