From: "Jan Djärv" <jan.h.d@swipnet.se>
To: Chris Zheng <chrisdcheng@gmail.com>
Cc: Adrian Robert <adrian.b.robert@gmail.com>,
"emacs-devel@gnu.org Development" <emacs-devel@gnu.org>
Subject: Re: State of NS port
Date: Sat, 12 Jan 2013 11:09:16 +0100 [thread overview]
Message-ID: <20AB1D9B-73FE-4B14-885E-95CFD2B5F8EB@swipnet.se> (raw)
In-Reply-To: <22C1B7A8E2294F08983ACE6BA77A7346@gmail.com>
Hello.
12 jan 2013 kl. 04:49 skrev Chris Zheng <chrisdcheng@gmail.com>:
> I suffered this problem too, and it's because of two bug fixes after I dig it awhile.
>
> bug#11484: 23.4; Scrolling leaves traces of old text behind
>
> http://lists.gnu.org/archive/html/bug-gnu-emacs/2012-05/msg00383.html
>
> LCD-smoothing was turned off to fix this bug,
>
> and
>
> bug#11541: - Another reproduction - Emacs 24.2; Null pointer on OSX with
>
> http://lists.gnu.org/archive/html/bug-gnu-emacs/2012-09/msg01293.html
>
> I simply revert these two fixes, and problem you mentioned is gone.
>
> So, maybe there are more deeper things around of these two bugs.
Yes there are. The first one is due to the fact that the font code miscalculates the font metrics when lcd-smoothing is on. It may be related to some premature optimizations such as caching of font metrics in the font code.
The second one is because the memory handling in the font code is incorrect and leads to crashes for some people (may depend on font and/or OS version and/or compiler version/settings). The second one does not happen when run in gdb. But when it does happen, as it does for me right now, Emacs crashes.
Jan D.
next prev parent reply other threads:[~2013-01-12 10:09 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-10 16:27 State of NS port Adrian Robert
2013-01-10 18:53 ` chad
2013-01-10 19:28 ` Stefan Monnier
2013-01-12 3:49 ` Chris Zheng
2013-01-12 10:09 ` Jan Djärv [this message]
2013-01-14 2:44 ` Chris Zheng
2013-01-14 9:35 ` Jan Djärv
2013-01-12 14:58 ` Harald Hanche-Olsen
2013-01-12 16:41 ` Jan Djärv
2013-01-15 17:57 ` Adrian Robert
2013-01-15 20:47 ` Jan Djärv
2013-01-16 13:46 ` Adrian Robert
2013-01-13 8:14 ` YAMAMOTO Mitsuharu
2013-01-13 12:23 ` Jan Djärv
2013-01-13 14:09 ` Jan Djärv
2013-01-14 3:07 ` YAMAMOTO Mitsuharu
-- strict thread matches above, loose matches on Subject: below --
2013-01-11 1:38 David Kanter
2013-01-11 16:13 ` Jan Djärv
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