[cairo] Call to cairo_paint triggers an assertion

[Tim Corio]

Joonas,

I built this very same program on a different machine and the original
symptom went away.  I don't think the library versions have changed
because I'm still including from the same directory names.

Now, it no longer crashes, but the resulting image is garbled.  It may
be a very skewed copy of the original.

If each line was skewed by one pixel the image would be recognizable,
but at a 45 degree tilt.  In this case the image is unrecognizable, but
the mix of pixel colors look about right.

Any help on this new symptom is appreciated.

Thanks,
Tim

On Sun, 2010-01-03 at 15:37 +0200, M Joonas Pihlaja wrote:
> Hi Tim,
> 
> I ran your program on my 64 bit Debian Linux Etch machine using 
> gtk+-2.0 version 2.12.12, whatever aged X.org server comes with Debian 
> stable, and various combinations of cairo 1.6.4, 1.8.x, and the 
> current cairo master, but couldn't trigger the assertion you saw.  It 
> even ran cleanly under valgrind.  Provided the GTK part of the code is 
> okay, and it looks fine to me (but then I know very little about GTK), 
> I don't see why it should crash for you.  If updating to cairo 1.8.6 
> doesn't help you, then perhaps you could give some more information 
> about your platform and versions of things.  That might help someone 
> with your platform to track down the bug.
> 
> Cheers,
> 
> Joonas