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Re: FT_Get_Advance() too slow?

From: Behdad Esfahbod
Subject: Re: FT_Get_Advance() too slow?
Date: Sat, 30 Jul 2022 14:05:54 -0600

Hi Werner,

Regarding this thread:

I finally spent enough time on it to have a clue. I wrote up my findings in a document:

The short answer is that basically fetching advances from hmtx is such a small bit of work, that HarfBuzz does it in just a few operations because of inlining, but all the function call and other overheads in FreeType add up...

hb-ft is also not asking FreeType for NO_SCALE where it, in theory, can. That's contributing to this as well, but only 10%.


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