580757 - [windows] Text renders with discolored edges when scrolling, when Cleartype is enabled

Status: RESOLVED FIXED

(Core :: Layout, defect)

Description

[Loïc Yhuel]

User-Agent:       Mozilla/5.0 (Windows; Windows NT 6.1; WOW64; rv:2.0b3pre) Gecko/20100721 Minefield/4.0b3pre
Build Identifier: Mozilla/5.0 (Windows; Windows NT 6.1; WOW64; rv:2.0b3pre) Gecko/20100721 Minefield/4.0b3pre

Text rendering is wrong when scrolling the search results, like if the AA was done with a wrong background color.

Reproducible: Always

Steps to Reproduce:
1. Type "test" in the search box and click search button.
2. Scroll the results dragging the srollbar or with keyboard arrows.




Cleartype is enabled.

Bug does not happen with Firefox 3.6.7.


Same kind of bug with https://brewmobileplatform.qualcomm.com/devnet/prod/resources/devEx/library/references/c/bmp_sdk_api_ref/HTML/APIReference.htm
Click on "index" and scroll the left frame.
The looks having a yellow border while scrolling.

Comment 1

[Loïc Yhuel]

Attachment: correct text when not scrolling

Comment 2

[Loïc Yhuel]

Attachment: wrong text when scrolling

Comment 3

[Loïc Yhuel]

Attachment: yellow border on another site

Comment 4

[Alice0775 White]

I confirmed that text is ugly while scrolling.
And it regressed with landing of Bug 564991.

Comment 5

[Daniel Holbert [:dholbert]]

This looks like the Windows-7-specific version of bug 579924.

Alice / Loïc, do you see a similar issue on the first line of
attachment 458449 [details]? (no scrolling required.)  (On Linux, I see a discolored stripe on the left edge of characters)

Comment 6

[Alice0775 White]

(In reply to comment #5)
> Alice / Loïc, do you see a similar issue on the first line of
> attachment 458449 [details]? (no scrolling required.)  (On Linux, I see a discolored
> stripe on the left edge of characters)

Yes,
In my case right-edige of  characters.
Mozilla/5.0 (Windows; Windows NT 6.1; WOW64; rv:2.0b3pre) Gecko/20100804 Minefield/4.0b3pre ID:20100804040859.

Comment 7

[Loïc Yhuel]

For me both left and right edges. The exact effect probably depends on the cleartype tuning values(In reply to comment #5)
> This looks like the Windows-7-specific version of bug 579924.
> 
> Alice / Loïc, do you see a similar issue on the first line of
> attachment 458449 [details]? (no scrolling required.)  (On Linux, I see a discolored
> stripe on the left edge of characters)

For me both left and right edges (all pixels which are not fully opaque or fully transparent look green). The exact effect probably depends on the cleartype tuning values.

Comment 8

[Daniel Holbert [:dholbert]]

All right -- I'm leaving this separate from bug 579924 for now, in case there are platform-specific solutions.

Comment 9

[Stanimir Stamenkov]

Could this be related to Bug 579276?

Comment 10

[Daniel Holbert [:dholbert]]

Yes, in that it looks like they're both ways in which bug 363861 manifests.

Comment 11

[Loïc Yhuel]

Checked on current nightly (with D2D off).