1830603 - background clipping with border-radius is broken in WebRender

Status: NEW

(Core :: Graphics: WebRender, defect)

Description

[Oriol Brufau [:Oriol]]

Attachment: testcase.html

Load testcase.
The cyan background is clipped with background-clip set to padding-box or content-box.
Therefore, it shouldn't overlap the magenta border.
But they can overlap when using border-radius.
This didn't happen before WebRender.

Comment 1

[Oriol Brufau [:Oriol]]

Attachment: bad (Gecko)

Comment 2

[Oriol Brufau [:Oriol]]

Attachment: good (Blink)

Comment 3

[Darkspirit (doesn't receive bugmail until AWS SES supports IPv6 DNS)]

KDE Wayland, Debian Testing, Intel
When the turquoise part became as misplaced as today:
MOZ_DISABLE_CONTENT_SANDBOX=1 mozregression --good 2017-10-10 --bad 2018-01-01 --pref gfx.webrender.all:true layers.acceleration.force-enabled:true gfx.webrender.enabled:true gfx.webrendest.enabled:true gfx.webrender.layers-free:true gfx.webrender.blob-images:true image.mem.shared:true layout.display-list.retain:false -a https://bug1830603.bmoattachments.org/attachment.cgi?id=9330872

2:49.71 INFO: Last good revision: 7c4579e705c4a3a3610183fe6f44affff3ad57ef (2017-12-19)
2:49.71 INFO: First bad revision: 62dd5404cf55e29412d5fff8fe9105076b1ca437 (2017-12-20)
2:49.71 INFO: Pushlog:
https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=7c4579e705c4a3a3610183fe6f44affff3ad57ef&tochange=62dd5404cf55e29412d5fff8fe9105076b1ca437

autoland builds are gone.
Likely:

16240aca46cbdcc67b48e5f47bfc92ef852a3e70 Kartikaya Gupta — Bug 1424631 - Update webrender to commit 1142dfc557c319119a5117450718c5b67a93cb9f. r=jrmuizel

= https://github.com/servo/webrender/compare/f9bc4a5c263e707e3498bea47d3ec9096cc3d099...1142dfc557c319119a5117450718c5b67a93cb9f

---

When the pink border temporarily became darker at 4 overlapping places:
MOZ_DISABLE_CONTENT_SANDBOX=1 mozregression --good 2017-01-01 --bad 2018-01-01 --pref gfx.webrender.all:true layers.acceleration.force-enabled:true gfx.webrender.enabled:true gfx.webrendest.enabled:true gfx.webrender.layers-free:true gfx.webrender.blob-images:true image.mem.shared:true layout.display-list.retain:false -a https://bug1830603.bmoattachments.org/attachment.cgi?id=9330872

6:14.18 INFO: Last good revision: 8e98dab5054dd093a37ba20c62cf0523e484cfbd (2017-05-19)
6:14.18 INFO: First bad revision: 8d60d0f825110cfb646ac31dc16dc011708bcf34 (2017-05-20)
6:14.18 INFO: Pushlog:
https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=8e98dab5054dd093a37ba20c62cf0523e484cfbd&tochange=8d60d0f825110cfb646ac31dc16dc011708bcf34

Comment 4

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

:kats, since you are the author of the regressor, bug 1424631, could you take a look?

For more information, please visit BugBot documentation.

Comment 5

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

Set release status flags based on info from the regressing bug 1424631