[Webkit-unassigned] [Bug 242420] avoid invalidating SVG resources when referencing element changes layout

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=242420

--- Comment #1 from Cameron McCormack (:heycam) <heycam at apple.com> ---
The pattern I will use for all of the resource classes is to store the dependencies that came from the referencing RenderElement (such as its object bounding box) on the data object we store in the HashMap of the resource container object.  Then, under applyResource, we compute those dependencies and compare them against the cached values.  If they differ, we invalidate the cached values (such as the RefPtr<Gradient> of a gradient resource or the RefPtr<ImageBuffer> of a mask resource) and recompute them.

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