Re: Screen artifacts on GUI applications

[Fred Kiefer]

This has been fixed in GNUstep back some time ago. Everybody using GNUstep from the SVN code should get the correct behaviour. The only thing that is still needed is to get this out in a GNUstep release, which should be expected in the next few weeks.

Fred

On the road

Am 12.04.2015 um 11:21 schrieb Edwin Ancaer <eancaer@gmail.com>:

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?

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