603627 - slow Rendering/Scrolling with Background Image using -moz-linear-gradient and background-size:1px ...;

Status: RESOLVED WORKSFORME

(Core :: Graphics, defect)

Description

[dbmontes]

User-Agent:       Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b8pre) Gecko/20101012 Firefox/4.0b8pre
Build Identifier: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b8pre) Gecko/20101012 Firefox/4.0b8pre

The error only appears with a background as the page, if he does variation some leave slow rendering. The problem is both windows and linux.

(traduction by google traductor, sorry for my English)

Reproducible: Always

Steps to Reproduce:
1.Go to http://www.setingo.com/demo_problem.html
2.Wait
3.Scroll and be happy my friend
Actual Results:  
The background render slooooowwww...

Expected Results:  
render more fast

This background css is from http://www.omgubuntu.co.uk
The problem is in windows 7 x64 and ubuntu 10.10 x64.

Comment 1

[(mostly gone) XtC4UaLL [:xtc4uall]]

Attachment: Reporter's Testcase

Confirmed on WinXP with Build built from http://hg.mozilla.org/mozilla-central/rev/2593c8c8af8b.

Comment 2

[j.j.]

> Created attachment 482571 [details]

This code is... stupid:
 background-size: 1px 199px;
repeats a 1px wide background.

 background-size: 100% 199px;   is much faster.

Comment 3

[j.j.]

Attachment: testcase with "background-size: 100% 199px;"

Comment 4

[dbmontes]

is true... the css is stupid. 
well, its not a bug, is a bad design of www.omgubuntu.co.uk.
sorry for the unnecessary notification.

Comment 5

[j.j.]

We are not committed to handle stupid code badly.
People with more knowledge should decide about this.

Comment 6

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

It's pretty fast on Mac actually. I wonder why.

It would be pretty easy to make this faster. We probably should, but we won't do it for Firefox 4 probably.

In the meantime, please do send feedback to the size recommending 100% instead.

Comment 7

[(mostly gone) XtC4UaLL [:xtc4uall]]

This is WFM using Mozilla/5.0 (Windows NT 6.1; WOW64; rv:16.0) Gecko/16.0 Firefox/16.0a1 ID:20120617030532 with HWA on.

Explicitly turning off Azure exhibits the originally reported Issue. Thus I think this has been fixed since Azure Landing.

Comment 8

[j.j.]

Mozilla/5.0 (Windows NT 5.1; rv:16.0) Gecko/16.0 Firefox/16.0a1

Not fixed, the second testcase has significant better scrolling performance on my system.

Comment 9

[Mayank Bansal]

both the attached testcases scroll fully smooth for me on the latest Nightly 21.

Comment 10

[j.j.]

confirming comment 9 with Nightly 21 from 2013-01-21
-> WORKSFORME