[Webkit-unassigned] [Bug 10403] SVG example exposes problems with <feImage>

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=10403





--- Comment #14 from Tim Horton <timothy_horton at apple.com>  2012-01-21 12:12:26 PST ---
(In reply to comment #13)
> I fixed the filter problem locally, though there's still a dynamic invalidation problem, which is tricky:
> The embedded document looks like this:
> <defs>
> <filter id="d" >
>     <feImage xlink:href="#r" result="grad" />
>     <feDisplacementMap scale="20" id="feDM"
>      xChannelSelector="R" 
>     in="SourceGraphic" in2="grad"/>
> </filter> </defs>
> <ellipse id="r" cx="50%" cy="50%" rx="80%" ry="80%"
> style="fill:url(#f)"/>
> <image filter='url(#d)' id="M" xlink:href='Manjbah4.jpg'  width="100%" 
> height="100%" preserveAspectRatio="none"/>
> </svg>
> 
> The host documents, add an <radialGradient id="f"><stop offset="..."> to the embedded document, and then changes the stop offsets using a <script>.
> 
> That _only_ invalidates the <ellipse> as it uses the fill="url(#f). There's no link between the <ellipse> and the <feImage/> so this filter is never going to be invalidated.
> 
> We don't support invalidation of any indirect references like this.
> If the <ellipse> would be a child of the <feImage> everything would work...

Technically <use> supports invalidation when a target referenced element changes, no? I wonder if we could adapt some of that mechanism?

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