1700921 - Flipping pages on Flippingbook.com is jerky with Webrender Software enabled

Status: NEW

(Core :: Graphics: WebRender, defect)

Description

[Timea Cernea [:tbabos][inactive]]

Affected versions:
88.0b2
89.0a1(2020-02-24)

[Tested Platforms]:
Platforms: Windows 7, Ubuntu 20.04

Graphics Cards:
Nvidia Geforce 730
Intel 4600
AMD 550

[Preconditions]:
Reach about:config and set both gfx.webrender.enabled, gfx.webrender.software - true

[Steps to reproduce]:

1. Launch the Firefox browser.
2. https://online.flippingbook.com/view/598058/
3. Flipp the pages by clicking on the ">" button or on the edge of the page

Expected Result:
The animations of flipping over the papers sheets should be smooth

Actual Results:
Flipping pages on Flippingbook.com is jerky with Webrender Software enabled

Notes:
Not reproducible with Webrender Software disabled nor Webrender disabled.
Screen Recording: https://www.awesomescreenshot.com/video/3177824?key=eba29dbbe55131973c4e2b0185f79d2a

Webrender Software profiler (repro): https://share.firefox.dev/3ss9Tsw
Webrender simple profiler (not repro): https://share.firefox.dev/39daTsN

Comment 1

[Jeff Muizelaar [:jrmuizel]]

Here's my profile: https://share.firefox.dev/2NPGQji

The time is mostly in blendTextureLinearFallback, blendTextureLinearRepeat and blendTextureLinear which are all relatively fast. Maybe there's too much drawing for some reason.

Comment 2

[Jeff Muizelaar [:jrmuizel]]

Here's a profile of basic compositor: https://share.firefox.dev/3lNtO2v

sw-wr: 160ms-170ms
basic: 140ms-200ms

so we're on the same order of magnitude.

Comment 3

[Jeff Muizelaar [:jrmuizel]]

Timea, can you confirm that you see similar slowness with gfx.webrender.force-disabled=true and layers.acceleration.disabled=true

Comment 4

[Timea Cernea [:tbabos][inactive]]

Yes, I can confirm the same slowness after switching the prefs you mentioned.

Comment 5

[Lee Salzman [:lsalzman]]

After the linear repeat slowness was addressed by bug 1678783, it looks like the biggest remaining issue here is cs_border_solid performance.