Why the dialog twinkle?

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Hi,
I'm a newer on MFC . Last month, I wrote a program using MFC and Vega Primer.Vega is a real-time 3D simulation development software kit.It provides many library. In my program,I create a window using Vega. I paste this window to the MainFrm.Then I create a transparent dialog on the top.when I am running my program on the Vista and Win7,it run well.But when this program runs on the Win XP ,the transparent Dialog will twinkle .
Hope you understand my issue.Thanks for all replies!
regards!
winshing

Posted 25-Sep-11 5:15am

winshing

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mbue 25-Sep-11 11:35am

Thats because vista and w7 gdi functions dont draw directly to the primary display surface. On xp the window content beneath you transparent dialog is painted first and the dialog is rendered with transparency over the background.
Regards.

Albert Holguin 25-Sep-11 16:37pm

Post as solution? ...although you're not exactly giving him a solution but you are telling him why its occurring.

mbue 25-Sep-11 16:42pm

I think the op wants an explanation. There is no solution by mine.
Regards.

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Albert Holguin · Answer 1 · 2011-09-25T10:40:00

Solution 1

If the problem is as mbue suggests, you can probably overcome the problem by detecting the OS at run-time, for XP and older, draw off screen then use bitblt to create smoother graphics. This method should also work for Vista and Win7 though, so maybe you can just use this technique all the time.

Posted 25-Sep-11 10:40am

Albert Holguin

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winshing 26-Sep-11 8:39am

Thanks,I will try it.