[cairo] [PATCH 0/2] Update pixman reference images

Bryce Harrington bryce at osg.samsung.com
Wed Oct 29 13:55:18 PDT 2014

On Fri, Oct 10, 2014 at 12:30:29PM -0700, Bill Spitzak wrote:
> On 10/10/2014 11:19 AM, Bryce Harrington wrote:
> >Will do.  All of these looked fine.  The 96:24 BEST cases looked
> >legitimately broken but I think that needs separate investigation.
> output/*best-25.*.argb32 are showing some transparency leaking in
> from the edges in my examples. Both the argb32 and rgb24 versions
> are showing ringing around all the color transitions, but this is
> going to happen with such a high-contrast source image.
> The good filter does not produce this ringing.

Yeah it sounds like ringing is an inevitable trade-off here.

So, should we just mark these tests xfail, or is it worth exploring if
we could do better in these corner cases?  If the latter, perhaps we
need a fairer test?
> I think these results are correct though eog likes to show the
> transparent leakage as a white edge. If you change it to composite
> atop black the edge disappears.

I've been using xzgv to view the images, fwiw.

> Attached are my results in case you are getting something different.
I've unfortunately cleaned up my previous results but I seem to recall
seeing something a bit more severe.  I'll doublecheck it after I've
finished the next weekly test run, tomorrow probably.


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