1666641 - Build hit-testing structure from clip templates

Status: RESOLVED FIXED

(Core :: Graphics: WebRender, task)

Comment 1

[Glenn Watson [:gw]]

Attachment: Bug 1666641 - Build hit-testing structure from clip templates.

Previously, the hit-testing structure was built from the set of
clip-chains supplied to the frame builder, but this has several
disadvantages. Now, the hit-testing structure is built during
scene building, flattening clip templates into a set of clips
that applies to each hit-testing primitive.

The advantages are:

• Most importantly, hit-testing doesn't rely on the existing
  clip-chain code, allowing changes and optimizations to that.
• No need to read all of the clips for the entire scene, only
  clips that are referenced by hit-test items are read (which
  is typically a small fraction).
• No need to read the clips each time the hit-tester is rebuilt,
  during frame building. Instead, the clips are read only once
  during each scene build.
• Clips are stored in the hit testing scene, and thus shared
  among all hit-testers created for a given scene.

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/11c0792e3eac
Build hit-testing structure from clip templates. r=nical

Comment 3

[Dorel Luca [:dluca]]

https://hg.mozilla.org/mozilla-central/rev/11c0792e3eac