293656 - Choppy scrolling with div having overflow:auto and png background image

Status: RESOLVED WORKSFORME

(Core :: Web Painting, defect)

Description

[José Jeria]

Build: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8b2) Gecko/20050510
Firefox/1.0+

Scrolling a div with overflow auto and a png background image is slower in
todays build (20050510). It looks like the background image moves along. 
Its smoother in build 20050509. 

The background image is transparent, so its a bit tricky to see this effect.
Hopefully its not just my eyes playing me a trick

Comment 1

[José Jeria]

Attachment: Testcase

Comment 2

[Boris Zbarsky [:bzbarsky]]

What are the hour stamps on those builds?

Comment 3

[Boris Zbarsky [:bzbarsky]]

José says those are both -07 builds, so the regression range would be:

http://bonsai.mozilla.org/cvsquery.cgi?treeid=default&module=all&branch=HEAD&branchtype=match&dir=&file=&filetype=match&who=&whotype=match&sortby=Date&hours=2&date=explicit&mindate=2005-05-09+07%3A00%3A00&maxdate=2005-05-10+07%3A00%3A00&cvsroot=%2Fcvsroot

I see nothing in that range that should be causing this, though...

Comment 4

[José Jeria]

Tested build 20050509 and 20050510 on a slower xp computer and I cant really
tell the difference. Scrolling is slow no matter what. Which makes me very
unsure of this bug. Am I the only one seeing this?

Comment 5

[Jason Bassford]

I can *definitely* see the background image moving (you scroll up, it moves
down, you scroll down, it moves up).  I can't say, however, if this is a
regression or not as I never tried doing this in earlier builds.

5/9-05 under XP.

Comment 6

[Robert O'Callahan (:roc) (email my personal email if necessary)]

retest this when 294324 is fixed.

Comment 7

[Ronald Tilby]

Bug 294324 has been fixed, and the testcase in this bug still shows the
background jumping during scroll.
Mozilla Trunk Nightly Build 2005052605 on Windows 2000.

Comment 8

[Martijn Wargers (dead)]

Attachment: testcase2

Well, I tried to make the choppy scrolling testcase a bit more clear and
removed the text and made the <div> larger.
When I test this I can see the same choppy scrolling and lagging
background-image in Mozilla1.7, so it certainly something that was already
there. But maybe it got worse.
Note that we have an overflow:auto <div> in an overflow:auto <div> here, that's
also something that the original testcase has.

Comment 9

[Martijn Wargers (dead)]

Forgot to say: when the inner <div> is not overflow:auto, but has no overflow,
you don't get to see the lagging background-image effect while scrolling.

Comment 10

[Connor McKay]

This bug doesn't need to have png background image, it happens with a jpg as
well. It's not quite as pronounced, but the background definitely moves.

Comment 11

[Jesse Ruderman]

Similar to bug 288508?

Comment 12

[Martijn Wargers (dead)]

This looks fixed to me now with current trunk build.
I bet this was fixed by bug 343430.

Comment 13

[AndrewM]

I can't reproduce this on a recent trunk build.

Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9b3pre) Gecko/2007121305 Minefield/3.0b3pre ID:2007121305

Comment 14

[José Jeria]

WFM too: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.9b3pre) Gecko/2007121605 Minefield/3.0b3pre

Nice!

:)