[HarfBuzz] Glyphs with negative advance width

[Olivier Berten]

After khmer character  ិ(glyph "uni17b7") in the string និង

Olivier


2013/6/13 Behdad Esfahbod <behdad at behdad.org>

> Ok, I'll take a look.  Can you send me the font?
>
> That said, The HarfBuzz API uses signed integers for advance.  So I'm not
> sure
> why this is happening.  Where do you observe this behavior again?
>
> b
>
> On 13-06-13 05:16 PM, Olivier Berten wrote:
> > 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 <mailto: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 <mailto:
> HarfBuzz at lists.freedesktop.org>
> >     > http://lists.freedesktop.org/mailman/listinfo/harfbuzz
> >     >
> >
> >     --
> >     behdad
> >     http://behdad.org/
> >
> >
>
> --
> behdad
> http://behdad.org/
>
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