Re: [ft-devel] [PATCH 1/2] Improve FT_Outline_Embolden for the unintended arfifacts problem (#45597).

[Alexei Podtelezhnikov]

> > +        /* The large shift value creates a cross point, which appears
> > +           as one of the artifacts. The shift value limitation inhibits
> > +           the occurrence of artifacts. */
> > +        shift.x = FT_MAX( FT_MIN( shift.x, strength.x ), -strength.x );
> > +        shift.y = FT_MAX( FT_MIN( shift.y, strength.y ), -strength.y );
> > +
>
> Maybe, it is threshold on the determinant. This inhibits the sarpen corner, 
> and
> the cross point artifacts.

Hmm. This is not invariant with respect to rotation. It will work
differently for along the axes and along 45 degree line. It is also
extremely restrictive: the shift magnitude (Euclidean) is always
larger than strength for any (even obtuse) angle. So even obtuse
angles are subject to this restriction sometimes. I wonder if this is
the reason you had to compensate with larger strengths in the second
patch. Have you tried limiting the shift to double or triple the
strength?