1008573 - Text rendering Issues when scrolling

Status: VERIFIED FIXED

(Core :: Graphics, defect)

Description

[(mostly gone) XtC4UaLL [:xtc4uall]]

Attachment: text_rendering_issues.html

Noticed rendering Issues when scrolling Bugzilla's CC Box and even in this Comment's box, i.e. parts of text geting bold. Does get invalidated by moving mouse cursor/when changing focus.

STR:
* see Testcase/Screenshot
* scroll up/down

It's a recent Regression:
Last good nightly: 2014-05-08
First bad nightly: 2014-05-09

Pushlog: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=2a03b34c8953&tochange=cf89b5d018f8

and further

https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=d002d113feca&tochange=d1155f994a3a
https://tbpl.mozilla.org/?tree=Mozilla-Inbound&fromchange=d002d113feca&tochange=d1155f994a3a

=> Bug 945079/Bug 938395

Still happens with https://hg.mozilla.org/integration/mozilla-inbound/rev/120d830b89e2

Btw, does not happen with OMTC enabled and does not happen with HWA disabled.
I repro'd this with an Optimus Notebook and a Desktop with AMD HD 4850.

Comment 1

[(mostly gone) XtC4UaLL [:xtc4uall]]

Attachment: bug_screenshot_1.png

Comment 2

[Elbart]

I could also reproduce this on a desktop-nVidia 640 (335.23) when scrolling down, but not when scrolling up.

Comment 3

[IU]

Also very visible when scrolling a bugzilla CC list.

Comment 4

[Alice0775 White]

In local build:
Last Good: a929ed3a2330
First Bad: d1155f994a3a
Regressed by 
d1155f994a3a	Matt Woodrow — Bug 938395 - Enable single rect painting for d3d10. r=Bas

Comment 5

[Matt Woodrow (:mattwoodrow)]

Attachment: Simplify before we clear the texture

Oops.

Comment 6

[Andreas Gal :gal]

I would move that one if lower and you probably didn't mean to change the pref.

Comment 7

[Matt Woodrow (:mattwoodrow)]

(In reply to Andreas Gal :gal from comment #6)
> I would move that one if lower and you probably didn't mean to change the
> pref.

All of these things are true.

Comment 8

[Matt Woodrow (:mattwoodrow)]

Attachment: Simplify before we clear the texture

Comment 10

[Matt Woodrow (:mattwoodrow)]

https://hg.mozilla.org/integration/mozilla-inbound/rev/2c50a4304ff5

Comment 11

[Carsten Book [:Tomcat]]

https://hg.mozilla.org/mozilla-central/rev/2c50a4304ff5

Comment 13

[Matt Woodrow (:mattwoodrow)]

Comment on attachment 8420719 [details] [diff] [review]
Simplify before we clear the texture

[Approval Request Comment]
Bug caused by (feature/regressing bug #): Bug 938395
User impact if declined: Broken scrolling for some pages
Testing completed (on m-c, etc.): Been on m-c for a few weeks
Risk to taking this patch (and alternatives if risky): Very low risk, fixes a known bug on something we just uplifted.
String or IDL/UUID changes made by this patch: None

Comment 14

[Ryan VanderMeulen [:RyanVM]]

https://hg.mozilla.org/releases/mozilla-aurora/rev/9374e6fdae90

Comment 15

[Paul Silaghi, QA [:pauly]]

Reproduced in Nightly 2014-05-09.
Verified fixed using the testcase and the cc list in bugzilla on 32.0a1 (2014-06-05), 31.0a2 (2014-06-05) Win 7 x64.