[Qt-interest] OpenGL & Vista without desktop composition bug !!!

[Dickymoe]

Hello,

Your win32 code should be ok and correct the problem.

This one wouldn't be add to the next Qt release ?

Best regards.

Vincent

On Wed, Oct 28, 2009 at 17:16, Kim Kalland <kim.kalland at nokia.com> wrote:

> Vincent LEFORT wrote:
> > Hello,
> >
> > We can see a problem under OpenGL with Qt when we run our program (or qt
> > demo) on Vista when the Aero Theme (desktop compositing) is disabled.
> >
> > _How to do : _
> >  - Launch for example the demo 2D painting.
> >  - Move a window above the opengl widget.
> >  - Alt+tab to get back the opengl application.
> >
> > => The opengl widget only refresh the region which was hidden by the
> > other window.
> >
> > This problem appear with some other GUI libraries (like freeGlut
> > or wxWidget <http://trac.wxwidgets.org/ticket/10168>) but not on win32
> > based application.
> > The problem does neither appear when dektop composition is enabled under
> > windows vista nor when the application is launched under windows xp so
> > without any hardware accelerated window rendering.
> >
> > You can see in attachment a screen shot of the problem.
> >
> > Do you know any trick to fix this problem ?
> >
> > Best regards.
> >
> > Vincent.
> >
> > ------------------------------------------------------------------------
> >
> >
> > ------------------------------------------------------------------------
> >
>
> I worked on a similar bug a while ago. I couldn't find a solution to the
> bug, and since the bug appears in several GUI libraries, I am tempted to
> conclude that this is a Windows bug. However, I found a workaround that
> you can try: Call SetWindowRgn(widget.winId(), 0, FALSE) before painting.
>
>
> Kim
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