[Bug 63633] Use UCD compat decompositions

[pango (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=63633
  pango | general | 0.x

--- Comment #24 from Philip Withnall <bugzilla at tecnocode.co.uk> 2010-05-08 00:27:03 UTC ---
(In reply to comment #23)
> (In reply to comment #22)
> > (In reply to comment #16)
> > > Sven, I'm currently thinking about how to best implement this.  I'll comment
> > > here in a few days.
> > 
> > Behdad, did you come up with a plan for this? If you can give me a starting
> > point, I'd like to hack on this bug.
> 
> Actually no, I didn't.  We may be able to solve this in HarfBuzz, but then
> remains fixing the font selection in Pango.

I've taken a look at harfbuzz-ng; am I correct in thinking that the solution
should be in hb_map_glyphs()? If it can't find a glyph for the current font and
a decomposition exists for the current codepoint, it could insert the
decomposed glyphs instead. Unfortunately, this means the buffer might have to
be reallocated. :-\

I don't know how this would fit in with falling back on different fonts in
Pango rather than decompositions.

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