[Webkit-unassigned] [Bug 52311] [chromium] Add command-line flag to enable composite to offscreen texture.

Wed Jan 19 14:08:08 PST 2011

https://bugs.webkit.org/show_bug.cgi?id=52311

--- Comment #42 from W. James MacLean <wjmaclean at chromium.org>  2011-01-19 14:08:08 PST ---
(In reply to comment #40)
> 
> When you say sporadic, do you mean different tests failing in every run or it always the same tests that fail? 

Always the same tests. 'Sporadic' in the sense that there is no strong pattern as to which pixels are affected, although I suspect the output is identical from one trial to the next.

> What is "x" ? The horizontal coordinate in the page?

Yes .... sorry, I should have been more specific :-)

(In reply to comment #41)
>Also, are the differences now limited to the color channels?  Is alpha always 1.0? 

I'm guessing ImageDiff just shows color channel differences ... I don't know for sure. I suppose it could be alpha ... but the -actual.png images appear to just be RGB, so if alpha is related it's been multiplied in.

> Does it look like it's around the edges of letters?  I wonder if it's somehow caused by subpixel AA in text...

It looks like it, although it's hard to tell ... the testing font is so 'skinny' in most of the tests that it's not always obvious if there are any interior pixels. On fast/canvas/canvas-text-alignment-diff.png it certainly looks to be limited to exterior font pixels. I'll upload the actual output from this test as an attachment.

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