[Webkit-unassigned] [Bug 44127] [chromium] Thumbnails not generated for GPU Rendered Pages

Tue Aug 31 13:59:11 PDT 2010

https://bugs.webkit.org/show_bug.cgi?id=44127

--- Comment #36 from Vangelis Kokkevis <vangelis at chromium.org>  2010-08-31 13:59:11 PST ---
(In reply to comment #35)
> (In reply to comment #34)
> > I would assume that using both the software and hardware paths is more resource intensive than using a single path, which in this case is (by definition) hardware. Secondly, presumably since we are using HW to speed things up, then this would also be desirable for thumbnail generation to also be accelerated (especially if the page is dynamic, and may need to be rendered repeatedly, meaning thumbnail generation could slow down subsequent page renders).
> > 
> > Finally, I don't know if it makes the controlling logic more complicated to have two different paths for rendering the same page, but I suspect it does.
> > 
> > Vangelis may have some additional thoughts here.
> > 
> > If you agree that HW readback is worthwhile for thumbnail generation, then I can proceed to look into the remaining issues.
> 
> Hmm, yeah upon reflection I agree that it seems like HW readback is the right answer.

Without h/w readback we'll be unable to capture the contents of WebGL, accelerated Canvas2D, and 3D CSS-transformed layers. So I don't think software is an option here.

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