1765726 - mask-image fails to render when viewport is wider than 2048px, parent element is larger than 2048px and has opacity <1

Status: RESOLVED WORKSFORME

(Core :: Graphics: WebRender, defect, P3)

Description

[Hansol Kim (zvuc)]

Attachment: Screen Shot 2022-04-21 at 16.09.07.png

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:99.0) Gecko/20100101 Firefox/99.0

Steps to reproduce:

Demo: https://codepen.io/zvuc/pen/OJzqgvQ

• Have an element with mask-image property
• Wrap it with a parent element that is wider than 2048px
• Add opacity to parent element lower than 1
• Extend the viewport size to wider than 2048px

Actual results:

The mask-image fails to render.

Expected results:

The mask-image should render properly.

Comment 1

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

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

Comment 2

[Timothy Nikkel (:tnikkel)]

Hmm, I guess I don't have a wide enough screen to reproduce this. Is this a new bug in 99? You can use https://mozilla.github.io/mozregression/ to help test that easily.

Comment 3

[Hansol Kim (zvuc)]

(In reply to Timothy Nikkel (:tnikkel) from comment #2)

Hmm, I guess I don't have a wide enough screen to reproduce this. Is this a new bug in 99? You can use https://mozilla.github.io/mozregression/ to help test that easily.

I can confirm that the issue did not exist prior to version 99. Tested on 98.0a1 and can't replicate the same bug on the test page.

Comment 4

[Hansol Kim (zvuc)]

Attachment: Screen Shot 2022-04-26 at 19.22.42.png

Comment 5

[Timothy Nikkel (:tnikkel)]

Okay thanks. Do you want to run a full bisection with mozregression to pinpoint what changeset caused this to start failing?

Comment 6

[Glenn Watson [:gw]]

This seems to work OK for me on a 4k monitor with the demo link - can you still reproduce?

Comment 7

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

Redirect a needinfo that is pending on an inactive user to the triage owner.
:gw, since the bug has recent activity, could you please find another way to get the information or close the bug as INCOMPLETE if it is not actionable?

For more information, please visit BugBot documentation.