Re: flicker graphics on window resize

Hi Fred and thank you for your hint,

I'm doing some debugging to see what happen on resize but It's not simple for me to understand the logic behind.

Currently I'm on IRC (freenode#gnustep nickname: nongio) if anyone would like to talk about this issue I would appreciate a lot!

On 17 December 2013 22:34, Fred Kiefer <fredkiefer@gmx.de> wrote:

You are welcome to look into this. Yesterday I tried to use valgrind
(callgrind in this case) to detect any anomalies, but couldn't spot any
big performance change to previous versions.

I also made a quick check and the problem shows up with the cairo and
the art backend, but not with the xlib one. This points in the direction
of the shared class XWindowBuffer, but that class no longer gets used by
the modern cairo implementation in GNUstep. There XGCairoModernSurface
gets used.

My feeling is that the X server tries to draw the window contents while
we haven't properly set up the surface to draw it. But this might be
completely off.

Sorry to be of so little help,
Fred

On 17.12.2013 10:10, Riccardo Canalicchio wrote:
> yes, I'm using GNUstep from SVN, someone is already working on this
> problem?
> If not, I would like to try to find a solution... Could someone please give
> me some hints to start investigate the problem?
>
> On 17 December 2013 07:35, Germán Arias <germanandre@gmx.es> wrote:
>
>> Hi,
>>
>> I suppose this is with GNUstep from SVN, right? I'm having the same
>> problem. The window show a black rectangle, that don't fit the window,
>> while I resize the window. This is not obvious in WindowMaker since, by
>> default, WM use a "phantom" resize. But if I change this at defaults, I
>> notice
>> this problem. However, as far as I remember, the ugly flickering as been
>> there always.
>>
>> Germán
>>
>> On 2013-12-16 12:38:28 -0600 Riccardo Canalicchio <
>> riccardo.canalicchio@gmail.com> wrote:
>>
>>> hi all,
>>> I'm experiencing a very annoying bug: during the resize of a window, the
>>> graphic rectangle occupied by the window starts to flicker until the
>> resize
>>> is done.
>>> When I say flicker I mean that the window content is displayed before It
>> is
>>> completely drawn.
>>> I'm using the cairo backend. Is this the default behaviour or I missed
>> some
>>> configuration steps?

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From:	Fred Kiefer
Subject:	Re: flicker graphics on window resize
Date:	Fri, 20 Dec 2013 10:12:12 +0100