From: Alan Mackenzie <acm@muc.de>
To: emacs-devel@gnu.org
Subject: How can I predict which regions xdisp will present me for font-locking?
Date: Sun, 11 Mar 2012 20:59:03 +0000 [thread overview]
Message-ID: <20120311205903.GA3717@acm.acm> (raw)
Hi, all.
I hope this isn't one of these "send complete details" questions, but:
In a file.hpp, inside a 3355 line macro (I kid you not), I type a single
character. xdisp responds by presenting jit-lock, successively, with
four areas to fontify. (This was determined by
trace-function-background on `font-lock-fontify-region').
None of these areas starts/stops at the top/bottom of the window. It is the
third area which encloses the changed line. The fourth area finishes
below the window's last line.
I can't see how this wierd sequence of fontification areas can be
being calculated by CC Mode.
This seemingly superfluous fontification seems to be causing a
performance degradation.
How can this series of fontification regions be explained?
--
Alan Mackenzie (Nuremberg, Germany).
next reply other threads:[~2012-03-11 20:59 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-11 20:59 Alan Mackenzie [this message]
2012-03-11 21:45 ` How can I predict which regions xdisp will present me for font-locking? Eli Zaretskii
2012-03-12 17:47 ` John Yates
2012-03-12 18:00 ` Eli Zaretskii
2012-03-13 19:50 ` John Yates
2012-03-13 21:00 ` Alan Mackenzie
2012-03-13 21:18 ` Eli Zaretskii
2012-03-12 18:49 ` Alan Mackenzie
2012-03-12 19:25 ` Stefan Monnier
2012-03-13 14:05 ` Alan Mackenzie
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