621330 - Animated PNG windows loaded locally don't animate after reload

Status: RESOLVED DUPLICATE of bug 601723

(Core :: Graphics: ImageLib, defect)

Description

[Jorge Villalobos [:jorgev] (he/him)]

Attachment: Simple test case. Loads a local animated PNG image

This was reported by an add-on developer in the Add-ons Forum: https://forums.mozilla.org/addons/viewtopic.php?f=7&t=1437&start=75#p5625

Steps to reproduce:
0) Download test html and png files.
1) Open test html file in Firefox 4. It should show an animated bouncing ball.
2) Reload page.

Observed result:
The ball is static.

Expected result:
The ball should continue bouncing.

I reproduced on beta 8, Mac OS X, and wasn't able to reproduce on 3.6.12. This happens with local files, like in the example, and chrome URLs (also local), like explained by the developer in the link above. If you go to http://en.wikipedia.org/wiki/Apng you can confirm that the bouncing ball always works on that page, suggesting the problem only happens with locally loaded files.

One more thing I noticed is that opening the PNG file directly on a tab always works, and it also fixes the problem. So, if you have one tab with the HTML page and one with the image, after the HTML page animation freezes you can just switch tabs to the image and back to the HTML page to fix the animation.

Comment 1

[Jorge Villalobos [:jorgev] (he/him)]

Attachment: Animated ball image. Required for test case.

Comment 2

[Alice0775 White]

Attachment: testcase

Duplicate of  Bug 601723?