Re: Apply #57432 fix to Ins_CALL too? And round mode 3

[Alexei Podtelezhnikov]

> > The third color is documented as reserved. I just reserved "zero"
> > rather than "same as gray", which is also zero. I never changed the
> > mode actually, I just referenced the third color instead of passing
> > zero explicitly in some cases. Where do you see a problem with that?
>
> Argh, I see what you are saying - but zero is not value zero, they are a set 
> of enums, really. And 3 is defined in freetype's code and not in the spec, 
> and a rather "unofficial" value.

Yes. There is bytecode-instructed rounding with 3 compensations and
there are all other kinds of rounding (Ingenuity, etc). I thought it
would be cleaner to reserve hard-zero for that. The out-of-spec
instructions would use zero as well, while Gray can be patched in
arbitrarily.