Comment 87 for bug 217908

(In reply to comment #4)
> For the record, I see no regressions in the reftests with this change, but the
> reftest included in the patch fails -- still analyzing. I think it's an
> accident of how I wrote the test.

Bad news: the reftest failure in the patch seems to be caused by going back to whatever Cairo's default is for resampling on image upscale. With the patch as posted, the test file's images are rendered with a very slight color gradient: at about one-third of the way across each image, the white stripe changes from #ffffff to #fbfffb, and at about two-thirds across, the green stripe changes from #00ff00 to #04ff04. This does not happen if I leave in the call to pattern->SetFilter(0).

I'd be interested to know if this test fails in Windows and Mac builds.