[cairo] composites circle

[Alex Vazquez]

Fine. I can replicate the effect without the black background, but if i
draw the background i can't replicate the effect.
I do the next (No work fine):
1-Create a cairo_t paint the background and destroy this cairo_t
2-Create a new cairo_t and create the effect and destroy this cairo_t

Why if i create a new cairo_t the effect fail?

Code:
http://pasted.co/634b16c6

Regards!!


2016-01-13 21:59 GMT+01:00 Lawrence D'Oliveiro <ldo at geek-central.gen.nz>:

> On Wed, 13 Jan 2016 10:52:37 +0100, Alex Vazquez wrote:
>
> > I am trying replicate the next effect with cairo
> > http://postimg.org/image/ieohdu29t/
>
> That looks like 50% transparency between the circles, but opaque with
> respect to the background.
>
> This has to be done in two stages, rather like
> <http://default-cube.deviantart.com/art/Figure-Alpha-548702174>.
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> cairo at cairographics.org
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