[cairo] Problems with the gtk-x11 interface

Ashwin Bharambe ashwinb at gmail.com
Wed Dec 22 06:24:24 PST 2004

Thanks, Carl. I observed the same problem with the knockout sample
from Mono.Cairo. So, I would think the problem is within the knockout
sample and not within pycairo, probably.


On Tue, 21 Dec 2004 17:02:45 -0500, Carl Worth <cworth at cworth.org> wrote:
> On Sun, 19 Dec 2004 19:47:10 -0500, Ashwin Bharambe wrote:
> > I downloaded and compiled the latest cvs version of libcairo. I was
> > testing the cairo-knockout.py example from pycairo and I find that,
> > although the initial output is very beautiful, refresh (expose) events
> > are not handled properly! :(  After exposing the window again, the
> > output becomes erratic.
> I've just duplicated this bug with cairo/pycairo checked out from CVS
> today, (gtk 2.4.14 and pygtk 2.4.0).
> The "erratic" output I see is that the red, green, and blue circles
> are always drawn in the correct locations, but where the black circle
> and the checkered background are supposed to appear often only the
> background color appears.
> > Is there anything I am doing wrong here?
> I don't think so. :-)
> The original C/Xlib demo (cairo-demo/X11/cairo-knockout.c) has no such
> problems, so I don't think the bug is in core cairo.
> Also, the other pycairo demos I tried did not show the same
> problems. Notably, even when I threw an SVG file at svgview.py[*] with
> gradients and group opacity, (which should trigger most of the same
> code paths as cairo-knockout.py), it did everything fine.
> So, this may just be a bug in cairo-knockout.py, otherwise it is
> probably in pycairo somewhere.
> -Carl
> [*] PS. Steve, thanks so much for the python bindings to libsvg-cairo!
> This should be a lot of fun.

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