1737243 - animation rotation on svg causes artefact

Status: RESOLVED FIXED

(Core :: Graphics: WebRender, defect)

Description

[dmitrijs.balcers]

Attachment: Screen Recording 2021-10-22 at 11.25.10.mov

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.81 Safari/537.36

Steps to reproduce:

Open this on FF https://jsfiddle.net/tbg9av58/2/
Keep pressing Cmd + S (save) to trigger animation

Actual results:

see that the div with svg in it has some ugly artefacts during rotation.

Expected results:

There should be no ugly artefacts.
You can workaround this if you put backface-visiblity: hidden; like I did here: https://jsfiddle.net/5mbpdtrj/21/

Comment 1

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

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

Comment 2

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

The severity field is not set for this bug.
:emilio, could you have a look please?

For more information, please visit auto_nag documentation.

Comment 3

[Emilio Cobos Álvarez (:emilio)]

Attachment: Test-case from reporter.

Comment 4

[Emilio Cobos Álvarez (:emilio)]

The issue is much more evident when zooming in, but I can repro some minor artifacts.

Mozregression says https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=404680ad41e4e7d08aa46081a70095486f14e15f&tochange=e704e3565db9260efaa854f2916ca023b717db3c, which includes blob image changes in WebRender which look suspicious.

Comment 5

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

The severity field is not set for this bug.
:jimm, could you have a look please?

For more information, please visit auto_nag documentation.

Comment 6

[Jim Mathies [:jimm]]

Jeff, any chance your blob work here regressed this?

Comment 7

[Mayank Bansal]

This is fixed on latest Nightly.
Fix range:
Bug 1714763. When computing the local scale use the local transform and the parent scale rather than the local transform and parent transform. r=jrmuizel