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Screen Flickering

Started by Emagen Jun 28, 2000 at 3:22 PM 1 reply 400+ views

Original Post

Jun 28, 2000 at 3:22 PM

Hi everybody - I have a directdraw program that blts a bitmap to the screen in windowed and fullscreen mode. The way I have it that it blts a black background using a ddbltfx, then I blt the bitmap to the screen, then it prints out some text using HDC, and then I either do a blt or a flip, depending whether it is in fullscreen or windowed mode. The program runs, but the screen flickers, I think it has to do with the blt or the flip at the end. Does anyone know how I can fix it so that it does not flicker. Thanks

VyvyanBasterd

Jun 28, 2000 at 3:28 PM

OK, you have to make sure your backbuffer surface contains the same data as the primary surface when you flip it. Think of it this way:

Let''s say the backbuffer contains X, and the primary contains Y. If you continually call the flip (or simulate it in windowed mode), you will get XYXYXYXYXYXY...which''ll make a flicker between the two images.

So just Blt the data from the primary to the backbuffer. Better still, if the image is static, blt to the backbuffer, and then flip it only ONCE, and stop there.

Vyvyan

Emagen

Author

Emagen

Jun 28, 2000 at 3:38 PM

hi -

Do I need to create 2 different blts, one for windowed and one for fullscreen, where it blts to the backbuffer in fullscreen and blts to the primary in windowed?

Thanks

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