1429515 - webrender css filters output garbage on windows CI

Status: RESOLVED WORKSFORME

(Core :: Graphics: WebRender, defect, P1)

Description

[Aria Beingessner [:Gankra]]

Attachment: failures.txt

https://hg.mozilla.org/mozilla-central/raw-file/tip/layout/tools/reftest/reftest-analyzer.xhtml#logurl=https://archive.mozilla.org/pub/firefox/try-builds/[e-mail]-c1e2be219138fda41115bd2c48070cd29338c35d/try-win64/try_win10_64_test-reftest-e10s-bm109-tests1-windows-build1291.txt.gz&only_show_unexpected=1

I can't reproduce this locally on windows, but at least 38 tests on windows are currently failing because css filters (reftests/svg/filters/css-filters; nothing to actually do with svg) seem to produce fairly corrupted results. The colors are often desaturated or inverted, and sometimes the size is wrong. 

Two especially bad examples are:

== svg/filters/css-filters/blur.html svg/filters/css-filters/blur-ref.html
== svg/filters/css-filters/drop-shadow.html svg/filters/css-filters/drop-shadow-ref.html

Comment 1

[Aria Beingessner [:Gankra]]

Attachment: expected-vs-actual

Here's a screenshot of what the corrupted results look like

Comment 2

[Aria Beingessner [:Gankra]]

Attachment: more-failures.txt

An additional 50 failures in css-blending seem to be the same problem. (again can't repro locally)

Interesting case: 

== css-blending/blend-gradient-background-color.html css-blending/blend-gradient-background-color-ref.html

Comment 3

[Aria Beingessner [:Gankra]]

Attachment: maybe-related-failures.txt

Found some more that look like the same issue

Comment 4

[Milan Sreckovic [:milan] (needinfo for best results)]

Maybe Markus can help us?

Comment 5

[Markus Stange [:mstange]]

If we have a machine that reproduces the problem, I can create a reduced testcase and file a bug on the webrender repo, sure.

Comment 6

[Aria Beingessner [:Gankra]]

Kats is getting a loaner to investigate some of these CI-specific issues.

Comment 7

[Kartikaya Gupta (email:[e-mail])]

On the new hardware it looks like these tests are passing just. Or they got fixed in the meantime. At any rate, nothing to do here, closing.