1652266 - Improve blur with software WebRender

Status: RESOLVED FIXED

(Core :: Graphics: WebRender, enhancement, P3)

Description

[Jeff Muizelaar [:jrmuizel]]

Doing blur the same way we do it on the GPU is a bad idea. The current GPU blur relies heavily on texture sampling which is the thing that SWGL is the worst at.

See https://share.firefox.dev/329F4hM for an example profile where blur is the bottleneck.
This is from "scrolling old reddit with subreddit styles off"

Comment 1

[Lee Salzman [:lsalzman]]

https://www.bostonherald.com/2020/10/30/majority-of-massachusetts-coronavirus-clusters-are-from-households/ if you move down to the "Top Articles" carousel seems to be a reasonably decent test page. It spends almost all its time in the blur shader...

Comment 2

[Lee Salzman [:lsalzman]]

Attachment: Bug 1652266 - implement Gaussian blur fast-path for SWGL. r?jrmuizel

Comment 3

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/8cf9fe4e2463
implement Gaussian blur fast-path for SWGL. r=jrmuizel

Comment 4

[Andreea Pavel [:apavel]]

https://hg.mozilla.org/mozilla-central/rev/8cf9fe4e2463