248360 - Animated gif as background image causes high CPU load, even when page obscured.

Status: RESOLVED WORKSFORME

(Core :: Graphics: ImageLib, defect)

Description

[Matthew Sibson]

User-Agent:       Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6) Gecko/20040614 Firefox/0.8
Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6) Gecko/20040614 Firefox/0.8

On the page given, underneith all of the tables is a animated background gif
(which can be seen by choosing 'view background image') which causes a full page
repaint for every frame of the animation, even when the image cannot be seen, or
the browser is on a different tab.

Reproducible: Always
Steps to Reproduce:





Constant repainting of the page produced by this bug makes it impossible to use
the browser.

Tested on FireFox 0.9 in Linux and Mozilla 1.8a2 (20040620)

Comment 1

[Bernard Alleysson]

WFM Mozilla/5.0 (Windows; U; Windows NT 5.2; en-US; rv:1.8a2) Gecko/20040615

Comment 2

[James Ross]

This happens on Windows too, though the effect is limited to when the tab/window
is visible (Moz 1.8a2, ID 20040620).

Comment 3

[R.K.Aa.]

Reporter: Are you quite sure this is a new bug?

A quick search turns up these seemingly related bugs: bug 15838, bug 141801, bug
151218, bug 194627 and there are probably more in the tracker bug. (bug 119597)

Comment 4

[R.K.Aa.]

adding dependency, but i believe this is covered in other bugs

Comment 5

[James Ross]

(In reply to comment #4)
> adding dependency, but i believe this is covered in other bugs

I agree, but (for example) bug 15838 may well be the same cause, however, the
bug itself defines itself to be more specific than this one, and even bit of a
different issue (no indication that the image in question can't be see - this
bug says nothing about the hidious CPU usage when you *can* see the image, only
that it should not be using all he CPU if the image is not visible).

Also, while on Matthew's 2.0GHz Linux it uses all the CPU, but on my 750MHz
Windows system it only uses ~60-70% CPU.

Comment 6

[R.K.Aa.]

to comment 5:
CPU usage when animation is not seen would be dup of bug 204002, dup'ed against
bug 120154

Comment 7

[Marius Strumyla]

i'm using ff0.9 on win2k. if i switch to another tab, the cpu usage drops from
%100 to ~ %1. i've got PIII 650mhz.

Comment 8

[Marius Strumyla]

i'm using ff0.9 on win2k. loaded the url then switched to another tab. the cpu
usage dropped from %100 to ~ %1. i've got PIII 650mhz.

Comment 9

[Wayne Mery (:wsmwk)]

http://www.7dayshop.com/catalog/default.php?cPath=777 has either changed or now works.  Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.2) Gecko/20070219 Firefox/2.0.0.2  tested also in suite

closing WFM.