1431932 - Flickering then missing gradient on https://www.enercity.de/privatkunden/index.html

Status: RESOLVED FIXED

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

Description

[Darkspirit]

Attachment: 2018-01-20_16-23-14.mp4

a) The gradient sliding to the left is buggy. In the past it was sometimes more/less/differently buggy.
b) The forward and back button on the lower right of it is currently completely invisible.

Attached video:
top left = 2017-05-19(*), mostly good (but I can't click on the forward button)
top right = today's 20180120100135, my main profile (a fresh profile with WR looks the same)
bottom right = today's 20180120100135, fresh profile without webrender

*) I think this won't be that helpful:
mozregression --good 2017-05-10 --bad 2018-01-10 --pref layers.acceleration.force-enabled:true gfx.webrender.enabled:true gfx.webrendest.enabled:true gfx.webrender.layers-free:true gfx.webrender.blob-images:true startup.homepage_welcome_url:"https://www.enercity.de/privatkunden/index.html"
> https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=5a8f2dcbeac0677b5aae0f9fd43d6a33309b4a6b&tochange=979f11deabd01d6cb897d064d3d9ed11ea8baa93
2017-05-19: There are 3 webrender updates.

Comment 1

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

You're right, the regression range is too old to be particularly helpful. This appears related to stacking contexts and transforms; the element in question has a rotate/skewX transform - if I remove that style the element appears. Setting any transform at all seems to make the element disappear which makes me think that it's because the element generates a reference frame in that scenario. I'll leave this assigned to me for now.

Comment 2

[Darkspirit]

try builds from bug 1439565:
> WR @ 3797d9c9c28f93738bb037cddadee6c1e72e85e0
mozregression --repo try --launch ddc8f978d3bfb1b75a40631486130ac10ba0ef38 --pref gfx.webrender.all:true startup.homepage_welcome_url:"https://www.enercity.de/privatkunden/index.html"
bad

> WR @ 2d2d7b7f293eaac2b463fe0e61a7face9253053e
mozregression --repo try --launch 3c1d576ae6c701b62efc56619583b175c3898c84 --pref gfx.webrender.all:true startup.homepage_welcome_url:"https://www.enercity.de/privatkunden/index.html"
good

Fix range: https://github.com/servo/webrender/compare/3797d9c9c28f93738bb037cddadee6c1e72e85e0...2d2d7b7f293eaac2b463fe0e61a7face9253053e

Thanks! :)