From: Stephen Berman <Stephen.Berman@gmx.net>
To: emacs-devel@gnu.org
Subject: Re: "Bold" effect when anti-aliased glyphs are overwritten
Date: Wed, 28 May 2008 10:49:18 +0200 [thread overview]
Message-ID: <87hcciyfsh.fsf@escher.local.home> (raw)
In-Reply-To: 87mymb4fp2.fsf@stupidchicken.com
On Tue, 27 May 2008 17:09:29 -0400 Chong Yidong <cyd@stupidchicken.com> wrote:
> Chong Yidong <cyd@stupidchicken.com> writes:
>
>> I've been noticing that glyphs near the cursor occasionally become
>> "bold" for no reason.
>>
>> The reason this happens is that when the redisplay engine calls
>> draw_glyphs to draw certain glyphs, such as the cursor glyph,
>> neighboring glyphs are redrawn if there is a left or right overhang
>> (xdisp.c:19929).
>>
>> With anti-aliasing, it doesn't work well. Apparently, during the
>> anti-aliasing calculation, the entire existing glyph---including the
>> glyph foreground---is treated as the "background". Thus, the
>> anti-aliased parts of the foreground character becomes more and more
>> prominent, and eventually saturates completely.
>
> I've checked in a fix into CVS. Please let me know if it causes any
> problems.
It fixes the cases I have encountered. Thanks!
Steve Berman
next prev parent reply other threads:[~2008-05-28 8:49 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-27 17:51 "Bold" effect when anti-aliased glyphs are overwritten Chong Yidong
2008-05-27 21:09 ` Chong Yidong
2008-05-28 8:49 ` Stephen Berman [this message]
2008-05-27 21:18 ` Jason Rumney
2008-05-27 21:21 ` Chong Yidong
2008-05-28 2:21 ` Kenichi Handa
2008-05-28 0:30 ` Kenichi Handa
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