1818400 - Optimize primitive dependency checks in picture caching.

Status: RESOLVED FIXED

(Core :: Graphics: WebRender, task)

Comment 1

[Glenn Watson [:gw]]

Attachment: Bug 1818400 - Optimize primitive dependency checks in picture caching.

The main goal of this is to fix an implementation detail where the
WR code had to read every primitive in the tile even when checking
if a small sub-tile was valid (as the advance amounts of the
primitive dependency array vectors was stored in each primitive).

However, this patch itself is quite a significant optimization, it
improves displaylist_mutate by ~16%.

Instead of maintaining separate arrays for each dependency, use
a single byte array and use peek-poke to store these dependencies.

This simplifies the code for comparing dependencies, and makes the
traversal of sparse index buffers of the primitive array much faster.

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/bd35a3c3f267
Optimize primitive dependency checks in picture caching. r=gfx-reviewers,ahale

Comment 3

[Marian-Vasile Laza]

https://hg.mozilla.org/mozilla-central/rev/bd35a3c3f267