Re: [Render] Re: OpenType support in Pango

[Werner LEMBERG <wl gnu org>]

> It's true that the implementation in FT1 where the string is copied
> over for every lookup applied is not very suited to applying large
> sets of lookups, however I think the model:
> 
>  - Set per-glyph properties determining which lookups should be
>    applied.
>  - Apply a series of lookups to the entire string.
> 
> Is fine, and a lot simpler than alternatives.

Note that the FT1 code has been written mainly for demonstration
purposes.  I'm not a specialist for string manipulation, and I'm sure
that a more efficient implementation is possible.

What exactly do you mean with `alternatives'?  Data-structures
resp. implementation issues or the lookup algorithm itself?  If you
mean the latter, can you please elaborate?


    Werner