Since I didn't post a solution for zoom or spin blur, here's a method
you can try out.
A way to account for zoom or spin blur is to do the following:
Perform a polar transform on the bitmap.
Horizontal blur (or vertical blur) the transformed image
Reverse polar transform
Result is a spin blur (or zoom blur if vertical blur is used)
The problem there is that a polar transformation on a bitmap requires
a loop over every pixel. No bueno for real-time effects.
cheers,
Jon
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