Bug 1914322

Summary:	weasyprint fails to build: expected rgba(0, 255, 0, 255), got rgba(127, 255, 127, 255)
Product:	[Fedora] Fedora	Reporter:	Miro Hrončok <mhroncok>
Component:	weasyprint	Assignee:	Felix Schwarz <fschwarz>
Status:	CLOSED RAWHIDE	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	rawhide	CC:	fschwarz, mhroncok, spacewar, thrnciar
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Last Closed:	2021-08-07 19:11:49 UTC	Type:	Bug
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Description Miro Hrončok 2021-01-08 15:24:01 UTC

weasyprint fails to build with Python 3.10.0a4.

E                   AssertionError: Pixel (1, 4) in float_inline: expected rgba(0, 255, 0, 255), got rgba(127, 255, 127, 255)
E                   AssertionError: Pixel (1, 2) in table_vertical_align: expected rgba(255, 0, 0, 255), got rgba(127, 0, 128, 255)
...


For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.10/fedora-rawhide-x86_64/01865319-weasyprint/

For all our attempts to build weasyprint with Python 3.10, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.10/package/weasyprint/

Testing and mass rebuild of packages is happening in copr. You can follow these instructions to test locally in mock if your package builds with Python 3.10:
https://copr.fedorainfracloud.org/coprs/g/python/python3.10/

Let us know here if you have any questions.

Python 3.10 will be included in Fedora 35. To make that update smoother, we're building Fedora packages with early pre-releases of Python 3.10.
A build failure prevents us from testing all dependent packages (transitive [Build]Requires), so if this package is required a lot, it's important for us to get it fixed soon.
We'd appreciate help from the people who know this package best, but if you don't want to work on this now, let us know so we can try to work around it on our side.

Comment 1 Miro Hrončok 2021-01-08 15:27:12 UTC

Also happens on rawhide: https://koschei.fedoraproject.org/package/weasyprint?collection=f34

Comment 2 Felix Schwarz 2021-01-08 15:38:05 UTC

I'll have a look later. Upstream is in the process of switching the main PDF backend from Cairo to a custom Python library so we'll see how this works out.

Comment 3 Felix Schwarz 2021-01-13 10:54:28 UTC

The root cause is an incompatibility with cairo 1.17. Upstream is switching to pydyf so they won't spend much time fixing WeasyPrint with newer versions of cairo. I'm not sure what to do next but help is appreciated.

Comment 4 Ben Cotton 2021-02-09 15:38:42 UTC

This bug appears to have been reported against 'rawhide' during the Fedora 34 development cycle.
Changing version to 34.

Comment 5 Felix Schwarz 2021-02-28 22:22:30 UTC

I bisected the problem back to a cairo change by Matthias Clasen which first appeared in cairo 1.17.4:
https://gitlab.freedesktop.org/cairo/cairo/commit/ea9329215d3431ded51a71b724baf0edc25ad633

It's a bit hard to simplify the failing WeasyPrint test cases but I sent an email to the cairo mailing list (https://lists.cairographics.org/archives/cairo/2021-January/029185.html, and another post just now).

WeasyPrint bug report is https://github.com/Kozea/WeasyPrint/issues/1291

Comment 6 Felix Schwarz 2021-03-16 20:47:27 UTC

The package now builds on F34 but still needs some fixing for cairo 1.17. Still working on it but it should not be considered a F34FTBS anymore.

Comment 7 Felix Schwarz 2021-08-07 19:11:49 UTC

We have WeasyPrint 53 in rawhide now and do not depend on cairo anymore. All tests are passing so I think we can close this issue :-)