[HarfBuzz] On optimizing HarfBuzz

[Behdad Esfahbod]

On 06/13/2012 10:27 PM, Just Fill Bugs wrote:
> 
> You can construct a map between
>  'lookup->sublookup->lookup_type->sublookup_type' -> 'sublookup coverage',
> before you doing the lookup.

Interesting.  My current thinking was to just reorder the loop-invariant
stuff.  And am playing with some C++ template meta-programming to do it.  It's
more fun :)).

But neat idea, I may as well implement yours.

Thanks,
behdad

> Then simply do a
> 
> for each coverage in map:
>     if glyph in coverage:
>          unpack lookup, sublookup, lookup_type, sublookup_type info
>          do stuff
> 
> This will only go through the
> for each lookup:
>     for each sublookup of the lookup:
>         switch  on the lookup_type:
>             switch on the sublookup_type:
> loop once.
> 
> Of course you can also cache the glyph ->
> 'lookup->sublookup->lookup_type->sublookup_type' info.
> 
> 
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