>> Sorry, bad wording. I mean that the user wants to position the
>> glyph at a non-integer x value, and the auto-hinter tries to `warp'
>> the glyph horizontally so that it still gets aligned to the grid.
>
> Ah, so fractional advance widths?
Yes.
> Aren't these conceptually incompatible with the autohinter method of
> snapping outer edges to the grid to achieve sharpness?
I don't think so, cf. the `warping' code in the auto-hinter.
> The only thing you could do would be to adjust stem thickness, but
> the autohinter doesn't do that iirc?
Correct, no stem thickness adjustment. The warper does scaling and
shifting instead, trying some configurations until it finds a best
one.
Werner
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