About the problem with the "images appear and disappear"

[John Shih]

Hi all,
As I trace the bug of Bug 799711 - [Clock] Update analog clock face background to avoid banding issues and UI flashing
this is a bug that when add a alarm in a analog clock page, the screen will twinkle during page loading

And I found that it is actually caused by the limit of memory of image-decoding
this modification is in the mozilla-aurora revision:380077b562e6af7ba12f2375e36cbc8ffc8bf32b
please see https://github.com/mozilla/releases-mozilla-aurora/commit/380077b562e6af7ba12f2375e36cbc8ffc8bf32b

I've both test with:
1. checkout the previous revision (0dd6e9f76c1083603cc541601a5677ade6bc2691)
(please see https://github.com/mozilla/releases-mozilla-aurora/commit/0dd6e9f76c1083603cc541601a5677ade6bc2691)

2.remove the change manually (that is, remove the pref("image.mem.max_decoded_image_kb", 5120) in gecko/b2g/app/b2g.js file)

These two ways both works (the page loading problem won't happen anymore)

And I think there are some bugs relate to this issue, such as
Bug 804055 - Launching of Solitaire app from marketplace - missing background image, constant card flickering, and many UI parts missing
Bug 807143 - images appear and disappear
Bug 803049 - [Gallery] Previews appear and disappear

And I also file this bug in bugzilla, please see
Bug 809077 - The memory limit of image decoding will cause the image loading with twinkling

Thanks,
John Shih
Intern of Mozilla Taiwan

[David Flanagan]

Nice work isolating this, John! \o/

David

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[Ian Liu]

Hi John,

Nice catch and thanks for your effort. :)
You help us to find out the root cause.

Best regards,

Ian Liu
Front-end Engineer
Mozilla Taiwan

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