just compile it.
basically the 2nd part of the code is supposed to look like the first.
the difference is just that the first part uses an intermediate image,
the 2nd part draws directly on the screen image (a layer).
without the fix, you get a 4 pixel red hook inside the blue rect.
with the fix, theres just a red and a blue rectangle one pixel
shifted apart and the blue one is overlapping the red one.
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cinap