Re: Screen artifacts on GUI applications

[Riccardo Mottola]

Hi,

I posted to the list just a few days ago the exact commit where the fix 
was implemented, it is very easy to backport in case you need.

Riccardo

Edwin Ancaer wrote:
> Sara
>
> I think ihad the same issue a few weeks ago. This is the advice i got 
> from Fred Kiefer:
>
> 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?