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ftx font driver [Re: Low redisplay performance (23 regression)]

From: Kenichi Handa
Subject: ftx font driver [Re: Low redisplay performance (23 regression)]
Date: Thu, 23 Apr 2009 10:01:12 +0900

In article <address@hidden>, YAMAMOTO Mitsuharu <address@hidden> writes:

>>>>>> On Wed, 22 Apr 2009 17:30:37 +0200, Daniel Clemente <address@hidden> 
>>>>>> said:
> >   I haven't compared Emacs 22 and 23, but from a subjective point of
> > view I have noticed that latest Emacs 23 feels slow and updates too
> > much for a modern computer. Some particular problems I noticed
> > randomly:

> Which font backend driver are you using?  You can check it with (cdr
> (assq 'font-backend (frame-parameters))).  I found the ftx font driver
> was much slower than the xft one partly because of repeated
> calculations of font metrics.  (So I added some cache code to
> ftcrfont.c in my latest cairo patch posted here).

Please exlain why it calculates font metrics repeatedly.

As ftx font driver is not used by default on any platforms,
it is not tested well and I myself don't remember the code

Kenichi Handa

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