1412127 - Visual text corruption on hollywoodlife.com

Status: RESOLVED FIXED

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

Description

[Asif Youssuff]

Attachment: hollywoodlife-wr.png

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0
Build ID: 20171026100047

Steps to reproduce:

turn on gfx.webrender.enabled
turn on gfx.webrendest.enabled
turn on gfx.webrender.blob-images
turn on layers.acceleration.force-enabled

1. Navigate to: http://hollywoodlife.com/2017/10/24/who-is-heather-lind-george-hw-bush-accuser-sexual-assault/
2. Scroll down to section of article with text "She’s got a double out there, as the actress has a twin sister named Christina Bennett Lind."


Actual results:

Bad visual text corruption.


Expected results:

Clear text like when WebRender is off. 

See screenshot.

Comment 1

[Darkspirit]

Nightly 58 x64 20171026100047 de_DE @ Debian Testing (KDE, Radeon RX480)
fresh profile: layers.acceleration.force-enabled, gfx.webrender.enabled (also tested: + gfx.webrender.blob-images)

Can't reproduce. :/ (Btw, webrendest is gone: bug 1410824)

Comment 2

[Darkspirit]

(In reply to Asif Youssuff from comment #0)
Is this still broken for you?

Comment 3

[Asif Youssuff]

Attachment: wr-top.png

The text is now readable, but the text is notably darker and fuzzier when scrolled to "1. Heather has starred in numerous TV roles." vs. with WebRender disabled. 

See updated screenshot.

Comment 4

[Darkspirit]

Is it fixed now?

Comment 5

[Asif Youssuff]

No, it is the same as in comment 3.

Comment 6

[Aria Beingessner [:Gankra]]

The difference is that webrender is producing this page with greyscale text AA on linux, while gecko isn't.

On macos greyscale is correct, because the website sets `-moz-osx-font-smoothing:greyscale`. Possible webrender is accidentally processing that directive on linux too?

If so, this page should render with two identical lines on linux with webrender:

data:text/html,<span style="-moz-osx-font-smoothing:grayscale">Hello!!!</span><br><span>Hello!!!</span>

Comment 7

[Aria Beingessner [:Gankra]]

*correction: on macos the lines should be different, on linux they should be the same. If the bug is as I described, then you will see the lines as different on linux.

Comment 8

[Asif Youssuff]

Alexis, I just tried your test case in a Nightly profile where I can reproduce this bug (on Linux), and they look the same. Not sure what that tells you.

Comment 9

[Jeff Muizelaar [:jrmuizel]]

Asif, can you still reproduce this?

Comment 10

[Aria Beingessner [:Gankra]]

regardless, this has only ever been reported on linux, so not a release blocker.

Comment 11

[Asif Youssuff]

I can no longer reproduce this on the original hardware this was reported against.