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

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=40918

--- Comment #6 from Krzysztof Kosiński <tweenk.pl at gmail.com> 2011-09-16 11:53:21 PDT ---
(In reply to comment #3)
> In order to get consistent results ad to be able to follow the SVG
> specification you probably want to render it using CAIRO_EXTEND_NONE or you
> could cheat a little bit and move the focus slightly inside.
> (I would rather go for CAIRO_EXTEND_NONE, but it's probably much more work
> because you might have to recompute the big circle and the color stops)

I'm not sure if I understood that but using CAIRO_EXTEND_NONE would mean I'd
have to paint the shape twice: once to give it the outer color of the gradient
and the second time to actually paint the gradient. And on top of that the
inner part (e.g. the red circle) could still disappear.

The main reason I'm reporting this is because I have to "cheat" by a
substantial amount (multiplying the radius by 1 - 1e-6 is not sufficient) to
prevent this, and the required amount appears to depend on the pixel size of
the gradient after rendering.

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