How exactly do I draw to a BDirectWindow?

[X512]

@PulkoMandy

Also, if you use Invalidate() correctly, there will be glitches only if the window is being refreshed for other reasons (typically, you are dragging another window on top). You have to try very hard if you want to make a really bad flickering mess.

I made a simple test that demonstrates problem. It draw overlapping rectangles and call Invalidate() after finishing drawing. As you can see there are white stripe artifacts present.

It is fundamentally impossible to properly show animations with SetViewBitmap if drawing contains overlapping figures.