I've seen this before and worked with some engineers at Apple on
this during a Carbon kitchen. It's been a while, but as I recall
what happens is that beyond a certain point size, the glyphs start
running into precision problems with the math inside of ATS. As I
recall, what I did to fix it, was to always ask for a 1000 pt font
and then scaled the curves to the appropriate size.
Yup, that worked. So did you file a bug for this? If it's been a
while since you worked with Apple engineers on this, one would hope
that it would've been fixed by now.
As I recall, the problem was not really a bug so much as it was a
limitation of fonts in general (it looked A LOT like your screen shot
by the way. I think I was asking for a 1 point font originally and
trying to scale it up)
I don't see the bug in my font list which means we probably figured
out it would require a fundamental reengineering of ATS :-) I'm
afraid that I don't remember the details (this was carbon kitchen era
stuff... so I would have been dealing with it... five or six years
ago?).
If I had to guess, I would almost be willing to bet that 16.16 fixed
point math is involved in there somewhere. Converting that to floats
would probably introduce performance problems at the very least.
Scott
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