1635022 - Add support for specifying blend container

Status: RESOLVED FIXED

(Core :: Graphics: WebRender, task)

Comment 1

[Glenn Watson [:gw]]

Attachment: Bug 1635022 - Add support for specifying blend container

Previously, WR would internally mark a parent stacking context
as requiring isolation when a stacking context with mix-blend-mode
was encountered.

However, this adds significant complexity to scene building in
WR, meaning that several decisions related to stacking context
redundancy, clip chain roots must be delayed until the stacking
context is popped.

By requiring the display list to annotate blend containers (Gecko
already has all this information available), we will be able to
simplify this scene building logic, which will unblock some
ongoing improvements to how clips are handled.

The patch introduces stacking context flags, and ports the existing
is_backdrop_root bool to be part of these flags. It also removes
an unused old field, cache_tiles.

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/a70b26f401c2
Add support for specifying blend container r=kats,Bert

Comment 3

[Cristina Coroiu [:ccoroiu]]

https://hg.mozilla.org/mozilla-central/rev/a70b26f401c2