[HarfBuzz] Glyphs with negative advance width

[Olivier Berten]

Well... Harfbuzz will be the only one behaving that way then...
That font is rendered fine by Adobe, Microsoft, LibreOffice, ... and
fontforge as well as ttx/fontTools gives a negative advance width... I
guess this doesn't push fixing the font ;-)

Olivier


2013/6/6 Behdad Esfahbod <behdad at behdad.org>

> Hi Olivier,
>
> Thanks for the report.  I'm hesitant to make HarfBuzz return negative
> advance
> values as that can confuse downstream users.  If this doesn't prove to be a
> major issue, I think we should ignore it for now.
>
> behdad
>
> On 13-06-01 05:40 PM, Olivier Berten wrote:
> > Hi!
> >
> > Although it isn't complying with the TrueType/OpenType specifications,
> > some fonts have some glyphs with negative advance width.
> >
> > Advance width (in htmx) is defined as USHORT/uint16 but it seems
> > everybody else reads it as SHORT/int16.
> >
> > In the attached font, glyph "uni17b7" (khmer character  ិ) has a
> > negative advance width. You can try it with the string និងសមភាព
> >
> > I wouldn't call this a bug in harfbuzz since it's a font bug but for
> > compatibility reasons, it might be useful to change it...
> >
> > Olivier
> >
> >
> >
> > _______________________________________________
> > HarfBuzz mailing list
> > HarfBuzz at lists.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/harfbuzz
> >
>
> --
> behdad
> http://behdad.org/
>
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