Krita PRNG (minor nit)

[Cyrille Berger]

I did an other attempt using your initial shuffle, and changing the construction 
of the number to make it simpler. It gives slightly better results. I also try 
your algorithm, in krita, it also suffer from repetitive patterns. The main 
thing I noticed, is a symetry around the diagonal.

I think it comes from the way we combine x and y together to get a number, 
it's always a symetric operation (or an operation with a recurrence), even 
with the multiplication by a big number. Here it's about (x,y)~(x-1,y-4).


-- 
Cyrille Berger
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