1452289 - Drop shadows in webpages sometimes rendered as solid squares when WebRender is enabled

Status: RESOLVED WORKSFORME

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

Description

[hujq]

Attachment: mozilla.mov

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:61.0) Gecko/20100101 Firefox/61.0
Build ID: 20180406103336

Steps to reproduce:

Visit https://www.mozilla.org/en-US/firefox/ or https://www.reddit.com/ (need login), scroll up and down.


Actual results:

The drop shadow on the page is sometimes rendered as solid squares and flickering when scrolling.


Expected results:

With WebRender disabled, the drop shadow is rendered correctly.

Comment 1

[hujq]

Attachment: reddit.mov

Comment 2

[Darkspirit]

(In reply to hujq from comment #0)
> Created attachment 8965873 [details]
> mozilla.mov
The shadow is:
> box-shadow: 0 2px 2px rgba(0,0,0,.4);

WFM on Debian Testing (KDE, Radeon RX480, 2560x1440).
If I were able to reproduce this, I had marked this as duplicate of bug 1451478.
(Or this might be a different leftover/regression from bug 1434801.)

Comment 3

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

Mac only?

Comment 4

[hujq]

I couldn't reproduce on Windows on the same machine so it seems to be Mac only.

Comment 5

[Jeff Muizelaar [:jrmuizel]]

Since it doesn't happen on Windows dropping from blocking riding the trains.

Comment 6

[Darkspirit]

(In reply to hujq from comment #4)
> I couldn't reproduce on Windows on the same machine so it seems to be Mac only.

Is this bug still happening on Mac?

Comment 7

[hujq]

(In reply to Jan Andre Ikenmeyer [:darkspirit] from comment #6)
> (In reply to hujq from comment #4)
> > I couldn't reproduce on Windows on the same machine so it seems to be Mac only.
> 
> Is this bug still happening on Mac?

No. Looks like it's fixed.