>> However, it would fail miserably if lsb_delta and rsb_delta are
>> used to adjust integer advance widths by ±1 pixel, as documented in
>> the FreeType reference. *This* is what we can't neglect IMHO.
>
> With warping out of the way, the light mode becomes a clean case.
> The left phantom point stays at zero, i.e. lsb_delta is always zero.
> The right phantom point is simply rounded, i.e. rsb_delta is a
> rounding residual always between -31 and 32. Therefore,
> (prev_rsb_delta - lsb_delta) is always between -31 and 32 and
> advance is NEVER adjusted in light mode. ∎
I'm not talking about `light' mode! `lsb_delta' and `rsb_delta' were
mainly introduced for `normal' (i.e., `strong') auto-hinting.
Werner
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