644870 - Images underneath another images are showed for a split second if image is changed. This produces flickering.

Status: NEW

(Core :: Graphics: ImageLib, defect)

Description

[Sten Tibbing]

User-Agent:       Mozilla/5.0 (X11; U; Linux i686; en-US) AppleWebKit/534.16 (KHTML, like Gecko) Chrome/10.0.648.204 Safari/534.16
Build Identifier: Firefox 4.0

If an image is changed underneath another image, the first image is showed sometimes producing some flickering. This is not a problem with any other browser or Firefox 3.5

Reproducible: Always

Steps to Reproduce:
1.Open up www.elementaryos.org with Firefox 4.0
2.After loading an animated flipclock is showed.
3.Flickering occurs on random animations.

Comment 1

[AndreiD[QA]]

Reproducible on:
Mozilla/5.0 (X11; Linux i686; rv:2.0) Gecko/20100101 Firefox/4.0

There is random flicker during the numbers transition

Comment 2

[George Carstoiu]

 Mozilla/5.0 (X11; Linux i686; rv:2.0) Gecko/20100101 Firefox/4.0

I can also observe the flickering that occurs. Setting resolution to New.

Regression:

Last good:
Mozilla/5.0 (X11; Linux i686; rv:2.0b3pre) Gecko/20100728 Minefield/4.0b3pre
http://hg.mozilla.org/mozilla-central/rev/beab39d49de9

First bad:
Mozilla/5.0 (X11; Linux i686; rv:2.0b3pre) Gecko/20100729 Minefield/4.0b3pre
http://hg.mozilla.org/mozilla-central/rev/b26489e73818

Pushlog:
http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=beab39d49de9&tochange=b26489e73818

Comment 3

[Josh Matthews [:jdm]]

This was almost certainly a regression from bug 572520.

Comment 4

[Joe Drew (not getting mail)]

Attachment: test patch: force a sync decode when switching images

This patch will force the image to synchronously decode (if it's not already decoded) by way of a hack. If this fixes the bug, we should create a proper synchronous decode API.