1458993 - layout.display-list.show-rebuild-area does not work with WebRender

Status: RESOLVED FIXED

(Core :: Graphics: WebRender, defect, P2)

Description

[Markus Stange [:mstange]]

If you go to about:config and add a boolean pref with the name layout.display-list.show-rebuild-area and set it to true, and then go to http://news.ycombinator.com/ and hover over the comments links, you should only see blue boxes over those links and not over the entire page.

With WebRender on, the entire page stays blue.

Note that when you're on Mac, you have to disable overlay scrollbars in the system preferences, otherwise you won't get retained display lists.

Comment 1

[Matt Woodrow (:mattwoodrow)]

Just debugged this, it's because nsDisplaySolidColor::CreateWebRenderCommands uses the paint rect instead of the bounds.

Paint rect is just the display list building area with WR (and is the intersection of the item bounds, building rect and invalid rect with non-WR), so that's much bigger than needed.

So we're just drawing the blue boxes much bigger than we're supposed to be, RDL seems to be working fine.

Comment 2

[Matt Woodrow (:mattwoodrow)]

Attachment: Bug 1458993 - Use correct bounds for WR solid color. r?miko

MozReview-Commit-ID: Gp5C4v8qJXI

Comment 3

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/8e32d7856fd8
Use correct bounds for WR solid color. r=miko

Comment 4

[Stefan Hindli [:stefan_hindli]]

https://hg.mozilla.org/mozilla-central/rev/8e32d7856fd8