1368440 - Private window: Finite length animation is blocked for a while

Status: RESOLVED FIXED

(Core :: Graphics: ImageLib, defect)

Description

[roxleitan]

Attachment: iframe.mp4

Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:55.0) Gecko/20100101 Firefox/55.0
Build ID: 20170528030206

[Affected versions]:
Nightly 55.0a1

[Affected platforms]:
Windows 10 x64

[Steps to reproduce]:
1.Launch Nightly 55.0a1 with a new profile
2.In a new private window open the attached HTML
3.Open a new tab in the window opened at step 2
4.Open a new private window and navigate to about:memory
5.Click "Minimize memory usage" button
6.Go to the tab with the animation (opened at step 2)

[Expected result]:
The animation from all frames should be displayed with without glitches.

[Actual result]:
In the second iframe, the animation is blocked for a while (please see the attached screencast)

[Note]:
The issue is intermittent and I could reproduce it only in private window.

Comment 1

[roxleitan]

Attachment: test gif iframe.html

Comment 2

[Morris Tseng [:mtseng] [:Morris] (Inactive)]

I can reproduce in my latest Nightly.

Comment 3

[Timothy Nikkel (:tnikkel)]

The problem is that we layerize the image, discarding an image doesn't effect the surface we use to hold the layerized image, which means it can be re-used when we go back to the page, which is okay for non-animated images, because they don't change, but this is an animated image so the frame is stale.

Comment 4

[Timothy Nikkel (:tnikkel)]

Attachment: patch

Comment 5

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/mozilla-inbound/rev/3e1dea278428
Drop the layerized version of animated images when they are discarded so we don't show an out of date version of the image. r=aosmond

Comment 6

[Wes Kocher (:KWierso) (Not reading bugmail; email directly if needed)]

https://hg.mozilla.org/mozilla-central/rev/3e1dea278428

Comment 7

[roxleitan]

Attachment: 2017-06-09_12h39_09.mp4

I've managed to reproduce this bug on the latest Nightly 55.0a1 (Build ID: 20170608030205)on Windows 10 x64.
The issue is intermittent and sometimes, the animation from the second frame remains blocked.(please see the attached screencast)

Reopening the bug.

Comment 8

[Timothy Nikkel (:tnikkel)]

Can you please include your full steps in the video?

Comment 9

[roxleitan]

I tried several times but the issue is intermittent and I cannot catch it with the screen recorder.

Comment 10

[Timothy Nikkel (:tnikkel)]

I wasn't able to reproduce.

When you reproduce are you giving the gif enough time to finish (about 15 seconds)? In my testing the steps seem to take around 15 seconds, so if you are quick enough you can catch it before it's finished animating which would be interesting to know in which case it happens.

Probably best to file a new bug for that, it seems slightly different in that the animation seems to be stuck forever, instead of just temporarily. And we've now merged to beta, so any further fixes would be landing in a different version, that would make this bug confusing to understand.

Comment 11

[Timothy Nikkel (:tnikkel)]

ni to file the new bug

Comment 12

[roxleitan]

Hi,

I tried several times to reproduce the bug and I reproduce it only once. I quickly switched to the tab with the iframe so the animation should not be finished.

I filed bug 1372532.