1673225 - Webrender is not using RGB Subpixel Anti-Aliasing during animations or for stroked text

Status: NEW

(Core :: Graphics: WebRender, defect)

Description

[Marian]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.111 Safari/537.36

Steps to reproduce:

I open the https://www.reddit.com/

Actual results:

The fonts on this website not have RGB Subpixel Anti-Aliasing. Is Gray

Comment 1

[Marian]

Attachment: n1thR0W98p.mp4

After opening a Post on Reddit the RGB Anti-Aliasing seams to exists.
After a scroll of the page is vanish.

Comment 2

[BugBot [:suhaib / :marco/ :calixte]]

The severity field is not set for this bug.
:jimm, could you have a look please?

For more information, please visit auto_nag documentation.

Comment 3

[Jim Mathies [:jimm]]

Can you hook us up with a copy of your about:support text?

Comment 4

[Marian]

Attachment: Support.txt

Sure

Comment 5

[BugBot [:suhaib / :marco/ :calixte]]

The severity field is not set for this bug.
:jimm, could you have a look please?

For more information, please visit auto_nag documentation.

Comment 6

[Marian]

Attachment: TitleBar.png

1. If the title is bigger that Tab the RGB AA seams to disappear from it.
2. And when focusing the Address Bar

Comment 7

[Marian]

And about:preferences page is missing too.

Comment 8

[Jim Mathies [:jimm]]

Glen will investigate.

Comment 9

[Glenn Watson [:gw]]

I think that Chrome also doesn't do subpixel AA on reddit - due to the page layout have scrolling slices with transparent backgrounds. Would you be able to check on your machine if the subpixel results are different between Firefox and Chrome on reddit?

The other cases mentioned in comment 6 might be a bug, will need further investigation.

Comment 10

[Marian]

Attachment: Ipt0dsPUYX.mp4

With DirectX11 works good. Is something weird with WebRender.

About chrome... Chromium has too many problems with the font rendering and the AA. Not only on Reddit.
What I know they removed the Windows GDI (that uses the windows Clear-Type) and replaced with DirectWrite.
I can't read / look to chrome without hurting my eyes how thin and blurry is the font and not using the AA.

The YouTube left bar seams to have the same thing. When using scroll the AA is disappearing.

Comment 11

[Paul]

I am on Linux (Arch Linux - 5.12.9-arch1-1 - Intel i7-6700K with HD Graphics 530) and I also get this onyl the latest Nightly (with WebRender enabled). Is there any way to force enable subpixel anti-aliasing?