1260934 - Scrolling with WARP performs poorly

Status: RESOLVED FIXED

(Core :: Graphics: Layers, defect, P3)

Description

[Bas Schouten (:bas.schouten)]

George pointed out scrolling with WARP performs poorly compared to basic. He is right. I've identified some reasons and have some improvements.

Comment 1

[Bas Schouten (:bas.schouten)]

Attachment: Simplify shaders and blending mode used for opaque layers

This flag seems to bring performance of WARP on par with basic layers on my machine. WARP performs somewhat better on more complicated test cases (like first-harder on Jeff's people). However WARP also still uses considerably more CPU. We'll have to see if this is worth it but this patch is probably a good idea regardless.

Comment 2

[Bas Schouten (:bas.schouten)]

https://treeherder.mozilla.org/#/jobs?repo=try&revision=0a8b2fb0f4e7

Comment 3

[Bas Schouten (:bas.schouten)]

Rather: https://treeherder.mozilla.org/#/jobs?repo=try&revision=78a6e48be3b5

Comment 4

[Bas Schouten (:bas.schouten)]

Attachment: Simplify shaders and blending mode used for opaque layers v2

Fixed a small issue where blending should be enabled for masked layers.