[Webkit-unassigned] [Bug 71849] [GTK] Move towards Xvfb-less testing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=71849

--- Comment #8 from Carlos Alberto Lopez Perez <clopez at igalia.com> ---
I have opened the following bugs to track the WebGL, 3D and compositing related failures:

bug 169916 (css3/blending failures)
bug 169918 (compositing failures)
bug 169917 (webgl failures)
bug 166536 (webgl2 not enabled)

I also rebaselined a bunch of tests that looked to me like they were passing fine
(either the produced image was very similar to the Mac ports or the text diff was only a few pixels of difference)

I have tested to run all this tests inside Xvfb vs native X11/Xorg and the differences
where minimal and all related to WebGL. I summarized those differences here: https://bugs.webkit.org/show_bug.cgi?id=169917#c2

I expect the differences when running on wayland to be bigger.
I tried to run the tests with the virtualized weston (by passing --display-server=weston to run-webkit-tests script)
and indeed I got a big diff:

Regressions: Unexpected text-only failures (156)
Regressions: Unexpected image-only failures (4)
Regressions: Unexpected timeouts (8)


My bet is that this is caused because the nested compositor is unable to run in that environment. I will watch our Wayland bot (that runs on real wayland with an Intel GPU) to check what differences are compared to X.

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