Re: Scrolling problems in GNUstep with recent Linux distributions

[Fred Kiefer]

Thank you Edwin for testing this: I disabled the code for cairo > 1.13

Fred

Am 25.10.2014 um 17:42 schrieb Edwin Ancaer:
> Fred,
> 
> commenting out the special handling for cairo version > 1.8.0 solved the
> problem.
> 
> Thans a lot.
> 
> 2014-10-25 14:16 GMT+02:00 Fred Kiefer <fredkiefer@gmx.de
> <mailto:fredkiefer@gmx.de>>:
> 
>     Hi Edwin,
> 
>     yes, it is strange that you seem to be the only one that experiences
>     this issue.
> 
>     I promised some some time ago to look into this problem after coming
>     back from my holidays. I wanted to update my virtual Ubuntu machine and
>     inspect the situation there. As it turned you, I didn't even have an
>     Ubuntu virtual image :-(
>     I will have to download one, probably for Ubuntu 14.10 now, install
>     GNUstep on it and try with that. But that will require a lot more time
>     then I expected.
> 
>     In the meantime cairo 1.14 has been released and I would expect that
>     Ubuntu will use this in a few weeks. Maybe the issue will be resolved
>     that way.
> 
>     But none of this touches the question why it is only you, who is seeing
>     the issue. Maybe it is not cairo itself, but the graphics driver used?
> 
>     What you could do to investigate the issue yourself is to start
>     debugging in the GNUstep cairo backend. If I remember correctly the
>     method in question is in CairoGState
> 
>     - (void) compositeGState: (CairoGState *)source
>                     fromRect: (NSRect)srcRect
>                      toPoint: (NSPoint)destPoint
>                           op: (NSCompositingOperation)op
>                     fraction: (CGFloat)delta
> 
>     As you can see there is some special handling for copyOnSelf and that is
>     the case you are after. You will also see special handling for a cairo
>     version > 1.8.0, maybe cairo fixed this bug and that code wont be needed
>     starting with cairo 1.13.0?
> 
>     Fred
> 
> 
>     Am 25.10.2014 um 10:36 schrieb Edwin Ancaer:
>     > Hello guys,
>     >
>     > is there anybody who is using Gworkspace, ProjectCenter, Gorm.... in
>     > short any GNUstep application on an Ubuntu 14.04 or Fedora 19/20 based
>     > distribution.
>     >
>     > I'm asking because on these distributions, I'm experiencing problems
>     > when scrolling: the text gets blurred on the screen, the lines are no
>     > longer aligned...
>     >
>     > It might be due to an unofficial libcairo version 1.13...(I must be
>     > carefull here or Fred Kiefer will come and kick....) in these
>     > distributions , but I seem to be the only person complaining, So it must
>     > be that
>     >
>     >  1. everybody is using Gnustep on older distributions or on xxxBSD, or
>     >     on Hurd or on anything where you can youse GNUstep, except
>     >     Ubuntu/Fedora....
>     >  2. nobody is really using gnustep, but someone is pretending it is
>     >     still alive, and sending all these mails on this mailing list
>     >  3. I'm the only person with this problem
>     >
>     >
>     > In the last case, I will have to admit in public I'm the idiot that
>     > cannot even compile and install GNUstep (and I've done some
>     > installations the last weeks), and should be banned from using computers
>     > any longer
>     >
>     > I'm not asking that anybody solves this problem, but I need to know if
>     > I'm really unable to install GNUstep, or that there is at least somebody
>     > else with the same problems... or, in case of option 2, send me a
>     > private mail confirming GNUstep really is a joke. I promise I won't tell
>     > anybody.
>     >
>     > Hoping somebody can end this agony before it drives me mad,
>     >
>     > Edwin Ancaer