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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 16:56:53 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/23.0.60 (gnu/linux) |
Jason Rumney <address@hidden> writes:
> That is why I suspect there may be a problem with the setting of
> row->contains_overlapping_glyphs_p on Windows. We avoid calling those
> functions if that variable is not set. It may also be much more
> expensive to look up the glyph index points in Windows, that is the case
> for obtaining text extents, so it wouldn't surprise me.
>
> Another factor is that we do this all one character at a time, and each
> time on Windows we select the font into the current GC, then reselect
> the previously set font. This operation is also expensive, so it would
> help to have functions in the font backend interface for selecting and
> deselecting fonts. I already tried using prepare_face and done_face for
> this, but the calls overlap - ie we prepare a second face without
> calling done_face for the first.
Could you verify that setting the overlaps argument unconditionally to 1
in draw_glyphs indeed removes the performance problem? If so, we can
work around this.
- Re: Analysis of redisplay performance on Windows, Chong Yidong, 2008/07/26
- Re: Analysis of redisplay performance on Windows, Jason Rumney, 2008/07/27
- Re: Analysis of redisplay performance on Windows,
Chong Yidong <=
- Re: Analysis of redisplay performance on Windows, Jason Rumney, 2008/07/27
- Re: Analysis of redisplay performance on Windows, Chong Yidong, 2008/07/27
- Re: Analysis of redisplay performance on Windows, Jason Rumney, 2008/07/27
- Re: Analysis of redisplay performance on Windows, Chong Yidong, 2008/07/27
- Re: Analysis of redisplay performance on Windows, Adrian Robert, 2008/07/27
- Re: Analysis of redisplay performance on Windows, Chong Yidong, 2008/07/28
- Re: Analysis of redisplay performance on Windows, Jason Rumney, 2008/07/28
- Re: Analysis of redisplay performance on Windows, Kevin Yu, 2008/07/27
- Re: Analysis of redisplay performance on Windows, YAMAMOTO Mitsuharu, 2008/07/28
- Re: Analysis of redisplay performance on Windows, YAMAMOTO Mitsuharu, 2008/07/28