[Webkit-unassigned] [Bug 258310] Update handling of negative std.dev for feGaussianblur/feDropShadow

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=258310

--- Comment #2 from Said Abou-Hallawa <sabouhallawa at apple.com> ---
This is a degenerate case.

Currently WebKit disables the effect of the whole filter graph if the standard deviation is negative. See this code in buildFilterEffectsGraph():

    auto effect = effectElement.filterEffect(*inputs, destinationContext);
    if (!effect)
        return std::nullopt;

And see this code in SVGFEDropShadowElement::createFilterEffect():

    if (stdDeviationX() < 0 || stdDeviationY() < 0)
        return nullptr;

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