[HarfBuzz] Glyphs with negative advance width
behdad at behdad.org
Wed Jun 5 16:41:36 PDT 2013
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.
On 13-06-01 05:40 PM, Olivier Berten wrote:
> 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...
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