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.NET Forum / Windows Forms / Drawing / May 2008OptimizedDoubleBuffer and Layered Window!
Hello There, I've a layered window where I put a control in it to show as a popup. I'm providing rounded borders as well. I'm using Vista as My test environment and today noticed a strange thing. When Glass is enabled, there is no problem but when it's disabled (Vista Basic), the parts of the popup which should be transparent was visible. After some tests, I could correct this by turning the OptimizedDoubleBuffer to false in my control. I also saw this behavior in some XP boxes as well. My question is that, what is OptimizedDoubleBuffer doing differently in those 2 situations which makes the Layered Window to behave not correctly (My suspicious is that the created Graphics object does not hold a 32bit buffer in Vista Basic state) ? Is there any possibility to correct this as I don't want to sacrifice from double buffering? Thanks in advance... Regards, Özden using double buffering on a layered window is waste of time. Layered window provides a graphics device that is already attached to an in-memory bitmap which, depending on the LayeredWindow API used, is composited to the screen using either a global transparency or a per-pixel alpha value. The only thing you're doing when you double buffer a layered window is to decrease the graphics bandwidth.  SignatureBob Powell [MVP] Visual C#, System.Drawing Ramuseco Limited .NET consulting http://www.ramuseco.com Find great Windows Forms articles in Windows Forms Tips and Tricks http://www.bobpowell.net/tipstricks.htm Answer those GDI+ questions with the GDI+ FAQ http://www.bobpowell.net/faqmain.htm All new articles provide code in C# and VB.NET. Subscribe to the RSS feeds provided and never miss a new article. > Hello There, > [quoted text clipped - 19 lines] > > Özden Hello Bob, Actually I've noticed that layered windows are drawn different than regular windows before. It's good to hear that LayeredWindow does already provide something like a double buffer within it. In that case, all I've to do is switch off double buffering of a control whenever I need to show it in a popup. Thank you very much... Regards, Özden Irmak > using double buffering on a layered window is waste of time. Layered > window provides a graphics device that is already attached to an in-memory [quoted text clipped - 27 lines] >> >> Özden
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