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Re: Analysis of redisplay performance on Windows


From: Chong Yidong
Subject: Re: Analysis of redisplay performance on Windows
Date: Sun, 27 Jul 2008 21:18:28 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.0.60 (gnu/linux)

Jason Rumney <address@hidden> writes:

> One difference between Emacs 22 and 23 is that we compute glyph
> indexes properly in Emacs 23, while on 22 we use unicode code
> points. Since we call font->encode_char once per character rather than
> for a whole run, the overhead of selecting fonts into the GC is
> multiplied. As I suggested in my earlier email, new functions in the
> font backend interface to select a font for working with and releasing
> it when done, would help, as we could then skip doing this in
> functions like encode_char and text_extents.

Could you suggest precisely what interface we need?  I.e., could you
suggest function names and rought docstrings?




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