[Webkit-unassigned] [Bug 155288] Compositing layer is too large when inner element has a blur that is within bounds

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=155288

--- Comment #3 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
For box-shadow we do this:
        // Blurring uses a Gaussian function whose std. deviation is m_radius/2, and which in theory
        // extends to infinity. In 8-bit contexts, however, rounding causes the effect to become
        // undetectable at around 1.4x the radius.
        const float radiusExtentMultiplier = 1.4;

but recall that box-shadow's "radius" is actually 2 * sigma, so I think this agrees with the 3 * 1.87997127 / 2 = 2.82 for SVG.

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