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

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From: "Jan D." <jan.h.d <at> swipnet.se>
To: Chong Yidong <cyd <at> stupidchicken.com>
Cc: lbsmtp <at> gmail.com, Eli Zaretskii <eliz <at> gnu.org>, 1867 <at> debbugs.gnu.org
Subject: bug#1867: Resizing window causes text flickering when using antialiased font on X
Date: Thu, 06 Oct 2011 08:05:24 +0200

Chong Yidong skrev 2011-10-05 23:57:
> Eli Zaretskii<eliz <at> gnu.org>  writes:
>
>> The way redisplay is written, _any_ change to dimensions of _any_
>> window sets a flag that will cause a thorough redisplay of all the
>> windows on all the visible frames.  However, I'd expect that redisplay
>> of any window not affected by the resizing be limited to redrawing the
>> cursor.
>
> Resizing a window redraws all windows on the same frame, even those
> unaffected by the resizing.

But according to Eli, the redraw optimizations in Emacs display engine 
should not actually redraw anything in unchanged windows.
According to the desciption window 3 is totally unchanged, but flickers 
anyway.
But this was on 23.0.60.  Many bugs has been fixed since.

>
> The right way to fix flickering in Emacs is to implement double
> buffering, which is not a trivial project.

If we are aiming for a general solution across all ports this is true.
A pure X solution might be easier if we use the double buffer extension.

	Jan D.

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