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I’m drawing into a WinAPI-Window by using the SetPixel()-Function.
If I scale the window or lose focus (another window is on top) I lose the whole content that I draw into the window.
I just used
RECT rc;
GetClientRect(hwnd, &rc);
RedrawWindow(hwnd, &rc, NULL, RDW_NOERASE | RDW_NOFRAME | RDW_VALIDATE);
which helped to avoid redrawing the content when I move the window but scaling and losing focus still removes the content.
Does anyone have an idea what I missed?
Draw it to a buffer/bitmap and then draw that to your window.