[Webkit-unassigned] [Bug 90375] Parallel image decoders

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=90375





--- Comment #14 from Zoltan Horvath <zoltan at webkit.org>  2012-07-11 01:33:12 PST ---
(In reply to comment #13)
> You can check out the updated test results in the following URL:
> 
> https://docs.google.com/spreadsheet/pub?key=0Ar2smwimcenMdGpnTEw2clZjSTNkbXNFNFM5dkYyRGc&output=html

The results look promising!

> A few notes:
> - Adjust the threshold from 512x512 to 300x300

This sounds cool, because I made earlier an investigation about used image sizes based on the first alexa top150 sites and I can say that the most images have lower than 512*512 dimension: https://bugs.webkit.org/show_bug.cgi?id=71555#c7

> - Measure first painting time to make sure all the images are decoded.

How do you measure first painting time?

> However, there is still limitation. Even image heavy sites do not show all the images at once. To see all the images, we need to scroll down many pages. Because WebKit decodes images only when they need to be painted, not all the images are decoded in page loading.

I think it's normal behavior, I see this as an advantage. If we are decoding all images including the never shown ones then we would make extra useless cpu cost on the worker thread.

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