AAAH! Origin to both bugs is your random data.. there is of course sometimes a 4 inside!!
int(rand()/float(RAND_MAX)*4).
As the random generator is deterministic without initialization.. this always occured at the same value..
quick fix: quint8 base = qMin((quint8)3,data.at(i).at(j)); in the paint method
So now everything works.. and blazing fast :->
Good luck for your project!
Johannes
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