1791628 - moving gradients do not work as expected

Status: NEW

(Core :: Graphics: WebRender, defect)

Description

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User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:104.0) Gecko/20100101 Firefox/104.0

Steps to reproduce:

set a div with fixed height ( 500px )

add a linear-gradient with 45deg angle ( or any angle expept 0, 90, 180, 270 and 360 ) with 4+ colors as background image

with JS setInteval and a for loop change the where the first color starts ( or the last )

https://stackoverflow.com/questions/73766132/how-to-fix-the-flickering-shaky-gradient-on-firefox

Actual results:

if you follow the steps above you'll notice all the colors are shaking

Expected results:

Only the 1st color should move

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'Core::Layout' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Comment 2

[Mayank Bansal]

Regression range :
https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=1130661c79c222fb1acd29b7ec5dc5202cdd0d2d&tochange=6567bdeb3c1e97a75f12fd72d92a6fb4a2cfcc91

This just might be a result of me getting WR (in the form of sw-wr)

Comment 3

[Mayank Bansal]

Attachment: standalone testcase.html

Comment 4

[Timothy Nikkel (:tnikkel)]

Yeah, seems to be a webrender thing: using an old build if I disable webrender then that fixes it.

Comment 5

[Sotaro Ikeda [:sotaro]]

:gw, can you comment to the bug?

Comment 6

[Gregory Pappas [:gregp]]

This might have the same underlying cause as bug 1769968