Rotozoom without the skew

[James D Jarvis]

One thing I noticed tweaking DisplayImage, which you guys might want to go back and incorporate into your Rotozoom changes:

W& = _Width(Image&): H& = _Height(Image&)

Add a line below this one and make it:
W1& = W& *xScale: H1& = H& *yScale

Then when you do all the P(x) and P(y) calculations, you can use W1 and H1 and reduce the overall math in your routine, which would end up making it a little bit faster in the long run.  And, when it comes to graphics, any little speed boost (which as simple to implement as this one), is one that a programmer should always think about making use of. 

Thank you for pointing that out.