GNU bug report logs - #1867
Resizing window causes text flickering when using antialiased font on X

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From: Jan Djärv <jan.h.d <at> swipnet.se>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: "rgm <at> gnu.org" <rgm <at> gnu.org>, "1867 <at> debbugs.gnu.org" <1867 <at> debbugs.gnu.org>, "lbsmtp <at> gmail.com" <lbsmtp <at> gmail.com>
Subject: bug#1867: Resizing window causes text flickering when using antialiased font on X
Date: Wed, 5 Oct 2011 23:16:19 +0200

Hello.

5 okt 2011 kl. 22:29 skrev Eli Zaretskii <eliz <at> gnu.org>:

>> Date: Wed, 05 Oct 2011 19:34:45 +0200
>> From: Jan Djärv <jan.h.d <at> swipnet.se>
>> CC: rgm <at> gnu.org, lbsmtp <at> gmail.com, 1867 <at> debbugs.gnu.org
>> 
>>> So even when antialiased fonts are used, I wouldn't expect any
>>> flickering, because Emacs should notice that the window didn't change
>>> at all.  Unless, that is, redrawing the cursor on X involves redrawing
>>> parts of the window text.  Does it?
>> 
>> Yes, but just the character under the cursor.
> 
> And could redrawing a single character under the cursor cause
> flickering with antialiased fonts?

For that character it might happen if the clearing and writing is separated long enough in time. Depends on the speed of your machine. 

    Jan D. 

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