[cairo] Progressive slowness

Jeff Muizelaar jeff at infidigm.net
Thu Oct 11 14:12:06 PDT 2007

On Thu, Oct 11, 2007 at 05:08:37PM -0400, Jeff Muizelaar wrote:
> On Thu, Oct 11, 2007 at 10:02:44PM +0200, Nicolas Rougier wrote:
> > 
> > Hi all,
> > 
> > I've been using cairo to do a very simple application in python: moving
> > and zooming a box in a window. The app (see below) is ok but when I zoom
> > in, the app is getting very slow and speed up again when I zoom out. I
> > guess I did something wrong but I cannot find it. The only reason I see
> > for the progressive slowness would be that I'm drawing part of the box
> > far beyond the visible surface (when it's zoomed in) but I thought the
> > clipping what responsible for handling such cases. Any idea ?
> > 
> Looks like a rasterization problem. fbRaserizeEdges is spending a lot
> of time in the kernel page faulting, which is a little weird.

Maybe the big edges are causing a problem... I'm using cairo 1.2.6
here, which, ircc is before we did any clipping of the edges. It
wouldn't surprise me if this was fixed in git. If it isn't fixed, then
the problem becomes more interesting.


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