[HarfBuzz] fallback kerning

[Evan Martin]

I remember running into this issue when experimenting with harfbuzz-ng
some months ago.

For reference, take a look at commits
  d740c8f78bcbe80a8bcd8a9468830a406da37cc0
and
  e70f45eb522bcb41388cc218b79bbd6aaecf8050

On Tue, Jul 27, 2010 at 3:55 PM, Jonathan Kew <jonathan at jfkew.plus.com> wrote:
> Hi Behdad,
>
> We're seeing some widespread fonts (such as Verdana and Trebuchet) where there is a GPOS table that does *not* include a 'kern' feature, and an old-style TrueType 'kern' table is present. To support fonts like this, I think we need to modify the positioning logic so that the use of the fallback positioning code is not dependent simply on the presence of a GPOS table, but on whether it actually includes a 'kern' feature.
>
> Suggested patch is attached. This checks at feature-compilation time whether a 'kern' feature is present (or if it has been explicitly disabled), and returns a boolean to indicate whether kerning was "handled" at this level; if not, the fallback path will be used.
>
> Jonathan
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