* Fixed a float overflow in antialiased lines (this algorithm is a mess, and I need to rewrite it)
* Wrote a bunch of craderies degueulasses to avoid having y1 already defined in math.h
* Did I say this antialiased line implementation sucks ?
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routine. Note that it is not the "real" sharpen which should be built
on top of a gaussian kernel.
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about twice as fast as the original code in research/2008-displacement.
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