How to rotate square part of a pixmap 45 degrees?

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Abomination

@ Jesse
I Forgot to mention that I want to do this in MAxGui, so I suppose I can't do that?
@ ImaginaryHuman
I tried to follow what was going on in this thread: http://www.blitzbasic.com/Community/posts.php?topic=73042#816898
Don't know if this was the code You mentioned, but I was lost in so many ways, I just gave up.
@ Yan
Yes; that looks very adaptable. At least I think I can follow the flow.

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