When testing the cairo backend on Mac OS X, I did experience crashes with long
path lengths even with the current version (1.8.8) of cairo / pycairo. So the
path length check is still needed. I put it back in.
--Michiel.
--- On Mon, 2/22/10, Michiel de Hoon <mjldeh...@yahoo.com> wrote:
> From: Michiel de Hoon <mjldeh...@yahoo.com>
> Subject: Re: [matplotlib-devel] Path length in the cairo backend
> To: "Eric Firing" <efir...@hawaii.edu>
> Cc: matplotlib-devel@lists.sourceforge.net
> Date: Monday, February 22, 2010, 9:09 PM
> Yes I tried without path
> simplification, and I don't get any crashes. If we need to
> support older versions of cairo / pycairo, I suggest that we
> have the path length check after checking the version of
> cairo / pycairo, and that we perform the path length check
> after path simplification, so we know how many points will
> actually be drawn.
>
> --Michiel.
>
> --- On Mon, 2/22/10, Eric Firing <efir...@hawaii.edu>
> wrote:
>
> > From: Eric Firing <efir...@hawaii.edu>
> > Subject: Re: [matplotlib-devel] Path length in the
> cairo backend
> > To: "Michiel de Hoon" <mjldeh...@yahoo.com>
> > Cc: matplotlib-devel@lists.sourceforge.net
> > Date: Monday, February 22, 2010, 1:00 PM
> > Michiel de Hoon wrote:
> > > Dear all,
> > >
> > > The draw_path method in backend_cairo.py starts
> with a
> > check for the number of vertices in the path, and
> raises an
> > error if the path contains more than 18980 vertices:
> > >
> > > def draw_path(self, gc, path,
> > transform, rgbFace=None):
> > > if
> > len(path.vertices) > 18980:
> > > raise
> > ValueError("The Cairo backend can not draw paths
> longer than
> > 18980 points.")
> > >
> > > This was needed in the past when cairo version
> 1.4.10
> > / pycairo version 1.4.0 would segfault:
> > >
> > > http://sourceforge.net/mailarchive/message.php?msg_name=487E2E78.1050501%40stsci.edu
> > >
> > > However, we're now at cairo, pycairo version
> 1.8.8,
> > and I haven't seen any segfaults after removing this
> check.
> > >
> >
> > Is path simplification in effect? If so, have you
> > tested after turning simplification off, so that you
> can be
> > sure how many points cairo is trying to plot?
> >
> > Eric
> >
> >
> > > Does anybody object if I remove this check from
> the
> > code?
> > >
> > > --Michiel.
> > >
> > >
> > >
> > >
> > >
> >
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