[Webkit-unassigned] [Bug 27561] ImageDecoder enhancements for WINCE port

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=27561





--- Comment #34 from George Staikos <staikos at kde.org>  2009-08-14 11:25:55 PDT ---
(In reply to comment #33)
> (In reply to comment #32)
> > (In reply to comment #30)
> > > I wonder
> > > if it actually saves much time (it's only relevant while an image is
> > > half-decoded and being painted, and at that point the user isn't getting
> > > high-speed animation or similar anyway).  If it doesn't actually buy meaningful
> > > performance, then returning true for frameHasAlphaAtIndex() (either using the
> > > method it has now, which I think is fine, or pushing this into all the
> > > decoders, which I think is unnecessary code duplication for no benefit) seems
> > > like a simpler and better way.
> > 
> >    The performance issue is very valid for our target platform.
> 
> OK, do you have some data (e.g. page load times or animation frame rates)
> around this issue?  It would be helpful in deciding whether we should also try
> to convert the other backends over to a similar mechanism.  I could be totally
> overlooking a particular case where this is really useful.

No numbers right now but alpha blending is ugly, blitting is slow.  Every pixel
causes pain here.  I don't expect it to be an issue in other places.

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