[HarfBuzz] Funny effect of fallback mark positioning

Behdad Esfahbod behdad at behdad.org
Tue Mar 12 16:42:44 PDT 2013

Hi Khaled,

On 13-03-12 03:23 PM, Khaled Hosny wrote:
> Hi Behdad,
> When (accidentally) testing fonts that has no OpenType tables with
> vocalized Arabic text, the fallback glyph positioning gives a funny
> Tetris-like patterns. I like it :) but may be HarfBuzz should give up on
> fallback positioning if the mark will end up as .notdef.

Right.  Yeah, I knew about this.  Right now we're rather short on bits to
carry around to remember that a glyph is a notdef glyph, so I'll leave it as
is right now.  In the future we may do something based on the metrics of the
"mark" being unusual.


> See the attached image using a special version of Libertine:
> http://khaledhosny.org/files/tmp/libertine_r-noot.otf
> Regards,
> Khaled
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