Vista - AllowTransparency=True = CPU > 90%

Hi,

Just this question for people who can confirm this:

- A WPF normal window is rendered by GPU acceleration
- A WPF window with AllowTransparency="True" is rendered by CPU
The question is here cause I saw the performance are very bad when moving or
resizing (by event + code)

It true, the next question is why WPF doesn't use GPU for transparent window
?

Thx
-Vince

Hi,

vrithner@hotmail.com wrote:
> Hi,
>
> Just this question for people who can confirm this:
>
> - A WPF normal window is rendered by GPU acceleration
> - A WPF window with AllowTransparency="True" is rendered by CPU
> The question is here cause I saw the performance are very bad when
> moving or
> resizing (by event + code)
>
> It true, the next question is why WPF doesn't use GPU for transparent
> window
> ?
>
> Thx
> -Vince

That's correct on XP, but the good news is that transparent windows are
hardware accelerated on Vista. I am not sure what the exact reason is.

As an alternative, if you do CPU-intensive stuff in a transparent
window, you can use a Win32 window and include your WPF stuf into it.

HTH,
Laurent
--
Laurent Bugnion [MVP ASP.NET]
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