Krita PRNG (minor nit)

[Matthew Woehlke]

Matthew Woehlke wrote:
> I'm comparing notes now, will see if I can comment on the 'noticeable 
> pattern' mentioned in r934614; it may be a while before I can look 
> though as I am doing a full rebuild due to the qt-copy update.

Strictly looking at the code, I would guess it would help if the input 
wasn't 'x + y * a' (where 'a' is a relatively small number). As I recall 
from early experimentation, that's why I wanted the input number to be 
somewhat random-noise on its own, i.e. why I throw big numbers at the 
coordinates before feeding the resulting scalar to the meat-grinder.

I'm curious where the current algorithm came from? (Also if there is any 
reason for not using my latest suggestion other than that it does more 
operations per pixel?)

-- 
Matthew
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