1028369 - Incorrect font rendering after small delay

Status: NEW

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

Description

[Mark Straver]

Attachment: Font rendering example

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:30.0) Gecko/20100101 Firefox/30.0 (Beta/Release)
Build ID: 20140605174243

Steps to reproduce:

1. I logged into Twitter
2. Went to my notification area
3. Hovered over the icon of some linked accounts from a retweet. This pops up a small tooltip (bubble) with the name of the account.


Actual results:

Initial rendering of the font was correct (cleartype)
After about 1/2 a second, the font rendering would switch to a bolder type, which looks like greyscale subpixel rendering. See attached image for an example.

Of note, if hovering over a similar icon lower on the page, this "flip" doesn't happen.



Expected results:

Text should be rendered properly and not suddenly "change"


===
Additional info:
Firefox 30.0 release
ATI/AMD Radeon HD6870, latest drivers
HWA On, Direct3D10, Direct2D in use
Windows 7 SP1 with platform update installed
DirectWrite version: 6.2.9200.16492

Comment 1

[Mark Straver]

Playing around with different settings, one in particular changes this behavior:
Setting layers.force-active to true prevents the "flip" to greyscale, but at the same time also renders the text with incorrect cleartype parameters (seems to "double-up" on the subpixel rendering, causing a slight rainbow effect).

Comment 2

[Alice0775 White]

Regression window(m-i)
Good:
http://hg.mozilla.org/integration/mozilla-inbound/rev/33087122ace7
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:18.0) Gecko/18.0 Firefox/18.0 ID:20120916022601
Bad:
http://hg.mozilla.org/integration/mozilla-inbound/rev/6ee831a85d12
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:18.0) Gecko/18.0 Firefox/18.0 ID:20120916033402
Pushlog:
http://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=33087122ace7&tochange=6ee831a85d12
Regressed by : Bug 788044

Comment 3

[Alice0775 White]

Attachment: reduced.zip

Comment 4

[Mark Straver]

Anyone have any idea yet about this? We're now 8 months later with plenty of changes in the rendering engine (OMTC, DX11, etc.), but this still happens in Firefox (36) and nightly.

Comment 5

[u279076]

Does this still reproduce?

Comment 6

[Alice0775 White]

I can still reproduce on Windows10 Nightly52.0a1.

Comment 7

[Mark Straver]

Yes, this still reproduces.