2021812 - Ensure stacking context origins are always zero

Status: RESOLVED FIXED

(Core :: Graphics: WebRender, task)

Comment 1

[Glenn Watson [:gw]]

Attachment: Bug 2021812 - Ensure stacking context origins are always zero

This is a step toward removing stacking context origins entirely, part of
a large series of patches.

Update gecko + wrench to insert a translate-only reference frame for these
cases. This will simplify future work towards fractional scroll snapping.

Update fixed-position-scrolling-clip.yaml to express fixed-position item
bounds in root-reference-frame space directly, since the rf_mapper no longer
shifts them via the stacking context origin.

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/48f506218af4
https://hg.mozilla.org/integration/autoland/rev/399801f5e270
Ensure stacking context origins are always zero r=gfx-reviewers,nical

Comment 3

[Silaghi Andreea]

https://hg.mozilla.org/mozilla-central/rev/399801f5e270