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WM_ blank white ?



What WM_ message blanks the window client area to white?
I should maybe to intercept it, or is it something else?

I am using ddraw and sometimes after drawing to the surface
i get blank white result, both in normal and fullscreen mode.
In normal mode I have noticed that some type of redrawing of
all windows occurs before the contents of my window goes blank.


These are the messages I allready intercept:

{
case WM_PAINT:
case WM_SIZE:
case WM_MOVE:

GetWindowRect(hwnd,r);
if(ok)Draw();

break;
}


Thanks.

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