[HarfBuzz] Optmizing code using Harfbuzz

[Behdad Esfahbod]

Unless you show us some hard profiling data, I don't think there's much I can
do.  If it's good to run Firefox and GNOME, it out to be fast enough for a
mobile screen...  If you don't do anything else, it's no surprise that
harfbuzz is taking 95% of the time.  That doesn't mean anything.

b

On 11/04/10 11:34, Tom Hacohen wrote:
> On Thu, 2010-11-04 at 21:56 +0630, Keith Stribley wrote:
>> I assume you have implemented a Glyph Metric cache and perhaps a cmap 
>> lookup cache? If you are using freetype it definitely benefits from it.
> 
> First of all, the change was when adding harfbuzz, I had a working code
> before (with freetype) that was blazing fast. Checking with callgrind, I
> can see that harfbuzz is what taking all the CPU time, nothing more than
> that, so I don't see how the two are relevant. But yes, I have a lot of
> caching with freetype, and I also somehow cache the harfbuzz results.
> 
> After reviewing my code (well, it's not really my code) once more I
> noticed that I destroy harfbuzz cache quite often, I guess that's the
> issue I was experiencing, but still, I was destroying other caches as
> well and harfbuzz was the biggest CPU hog by far (95% harfbuzz and 5%
> the rest or something like that).
> 
> Thanks,
> Tom.
> 
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