[HarfBuzz] Can I only reshape broken clusters?

[Behdad Esfahbod]

No, it wouldn't be safe necessarily.  That's exactly what the
unsafe-to-break API is about, but that's not finished yet.  For now,
you have to reshape the entire new string.

On Thu, Jun 30, 2016 at 8:31 PM, Kelvin Ma <kelvinsthirteen at gmail.com> wrote:
> If I have the string A = 'affifibcd' and the master list of shaped glyphs
>
> [a 0] [ffi 1] [fi 4] [b 6] [c 7] [d 8]
>
> and I wanted to shape the substring A[2:] ('fifibcd'), could I simply take
> my preshaped glyphs after the cluster at or above (ceiling) i = 2 and only
> reshape the segment A[2:6]?
>
> So I would reuse the glyphs
>
> [fi 4] [b 6] [c 7] [d 8]
>
> and reshape the segment A[2:6] = 'fifi' to get
>
> [fi 2] [fi 4]
>
> and add them together (dropping the last glyph in the reshaped segment) to
> get
>
> [fi 2]  [fi 4] [b 6] [c 7] [d 8]
>
> ?
> Would this be the same result as reshaping the entire segment A[2:]? Would
> this still work for RTL text, or a substring that’s on the left-hand side of
> the parent string like A[:5] = 'affif'?
>
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-- 
behdad
http://behdad.org/