[cairo-bugs] [Bug 40918] Radial gradients misrendered if focus is exactly on the outer circle

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Fri Sep 16 12:04:50 PDT 2011


--- Comment #7 from Krzysztof Kosiński <tweenk.pl at gmail.com> 2011-09-16 12:04:48 PDT ---
(In reply to comment #4)
> Sorry, I just realized that maybe what you're actually reporting is that
> sometimes you do not see the red part, not that sometimes the gradient covers
> an half-plane, sometimes the whole plane.

This looks better, but the transparent area at the top right is still a
problem. I would have to fill it with a separate paint operation. Additionally,
I would need to reverse the order of stops.

Why is the order of circles not a problem for infocus* gradients, but suddenly
starts to matter for outfocus ones? Is there actually a situation where the
rendering from my testcase is preferred over the one from yours?

By the way - the problem could be solved without any magic by just filling the
half-plane which is now left transparent with the outer color of the gradient.
There would then be a smooth transition between outfocus and infocus gradients.

* - I invented "outfocus" as an abbreviation for "gradient with focus / inner
circle outside the outer circle" and "infocus" for "gradient with focus / inner
circle inside the outer circle"

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