These ref images might be wrong. Since the test failed here already before this
change, I took the old ref images and copied the new part from the test output
underneath it. For the backends that I don't have, I deleted the images (sorry).
After this, the "operator-source" test still fails for me on all backends, but
much more prominently so for the image backend. xcb-render-0.0/argb32 gets
compared against a rgb24 ref image, but apparently this was already the case
before(?). The rest are minor differences.
This reveals a bug in the image backend. This was originally reported here:
http://lists.cairographics.org/archives/cairo/2011-March/021827.html
Signed-off-by: Uli Schlachter <psychon@znc.in>
