1629927 - Scroll Effect in https://www.apple.com/iphone-11-pro/ is not work properly with webrender

Status: RESOLVED DUPLICATE of bug 1619367

(Core :: Graphics: WebRender, defect)

Description

[Tetsuharu OHZEKI [:tetsuharu] (UTC+9)]

Attachment: with webrender.mov

Environment

• macOS 10.15.4
  • MBP 15 (2017 Mid), GPU is Intel HD Graphics 630.
• https://hg.mozilla.org/mozilla-central/rev/078326f48100828dc60d2e0ca2819164b8803b7d

Step to Reproduce

1. Open https://www.apple.com/iphone-11-pro/.
   • I captured the screen with https://www.apple.com/ja/iphone-11-pro/, but I confirmed this is reproducible on US page.
2. Scroll to "Pro camera system We’ve three‑upped ourselves".
3. Continue to scroll.

Actual Result

See attached movies.

• Without WR, the appeal for 3 camera highlights their lens and other parts are into dark with animations.
• With WR, this effect is not reproducible.
  • On macOS, other parts are not into dark.

Note

This is reproducible with Fenix Nightly on Android 10 with Pixel 3.
Fenix version is:

• Nightly 200408 06:01 (Build #20990610) 38.0.20200407190120, 4c77753ca
• GV: 77.0a1-20200407093520
• AS: 0.55.0

On Android 10 in my Pixel 3, the effect flashes. But this result sometimes does not reproduce.

Comment 1

[Tetsuharu OHZEKI [:tetsuharu] (UTC+9)]

Attachment: without webrender.mov

Comment 2

[Jeff Muizelaar [:jrmuizel]]

I can also reproduce this. It seems to be caused by the 0.15 opacity not properly applying to 'image-hardware-phone' some of the time.

It doesn't reproduce in a single filed saved version of the page.

The next best steps are probably to take a capture and see if it reproduces there.

Comment 3

[Jeff Muizelaar [:jrmuizel]]

Miko, could this be the same bug as bug 1619367?

Comment 4

[Miko Mynttinen]

(In reply to Jeff Muizelaar [:jrmuizel] from comment #3)

Miko, could this be the same bug as bug 1619367?

I think so. At least I cannot reproduce it locally with the patch applied.