[HarfBuzz] Possible bug in chain_context_lookup with Gpos

[Behdad Esfahbod]

Thanks Keith, I pushed a cleaner fix out.

behdad

On 01/06/11 12:36, Keith Stribley wrote:
> Hi Behdad,
> 
> I think there maybe a bug in the handling of kerns using format 3 Chaining
> Context lookups. When GPOS lookups are used, then the output part of the
> buffer does not seem to be used. In this case if there is a backtrack context,
> then the check (c->buffer->out_len<  backtrackCount) at the start of
> chain_context_lookup will always fail. For GPOS I think it should use the main
> buffer not the output buffer. Presumably the current code works fine for
> Chaining Contexts for GSUB lookups, but the attached patch may be necessary
> for GPOS.
> 
> This patch fixes the positioning of ့ in sequences like ကဲ့ for the Padauk font
> for example, so that HBNG then behaves the same as other renderers like ICU
> and Uniscribe.
> 
> thanks,
> Keith
> 
> 
> 
> 
> _______________________________________________
> HarfBuzz mailing list
> HarfBuzz at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/harfbuzz