[cairo] rendering changes cairo 1.16 -> 1.17.4

[Heiko Lewin]

Hello!

Yes, cairo does some anti-aliasing per default, though I am not aware of
any behaviour changes.

Can you set up a simple test-case that reproduces the problem?

To me it simply looks like some device-scaling and coordinates on
half-points.


On 1/13/21 12:06 PM, Felix Schwarz wrote:
> Hi,
>
> I'm trying to debug test failures in the WeasyPrint test suite (which
> uses cairo under the hood). The tests started to fail in Fedora
> rawhide around the same time as cairo 1.17.4 was added to Fedora.
>
> I attached an example rendering:
> - table_vertical_align.png is the actual rendering with cairo 1.17.4
> - table_vertical_align.expected.png is the rendering in cairo 1.16.
>
> My question is: Does anyone have an idea what could cause these
> rendering changes? Is there some new antialiasing setting enabled by
> default?
>
> Please note that I'm not 100% sure that the cairo update is actually
> the root cause but I got confirmation that others seeing these
> failures as well.
>
> Thank you very much,
> Felix
>
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