[Webkit-unassigned] [Bug 92470] Add more layout tests on image decoding

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=92470





--- Comment #3 from Hin-Chung Lam <hclam at google.com>  2012-08-06 17:55:02 PST ---
I still think we should have some unit tests for image decoding. I'm surprised to see a large of code under platform/image-decoders without low level functional testing. This is important to catch regression and crashes. Even if this is WebKit unit test instead of WebCore it will be very valuable. But before I stir up another unit test vs layout test discussion I would like to test this as best as I could with web platform first.

The first thing that is missing is the lack of pixel tests for partially loaded images. When an image is loaded from the network it is partially decoded and rendered with partial transparency.

We cannot test this today because DRT requires images to be loaded before dump the pixels. This forbids writing a test that simulate a stalled network. This seems like the first thing to work on. I'm picking this up.

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