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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Compositing layer is too large when inner element has a blur that is within bounds"
href="https://bugs.webkit.org/show_bug.cgi?id=155288#c3">Comment # 3</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Compositing layer is too large when inner element has a blur that is within bounds"
href="https://bugs.webkit.org/show_bug.cgi?id=155288">bug 155288</a>
from <span class="vcard"><a class="email" href="mailto:simon.fraser@apple.com" title="Simon Fraser (smfr) <simon.fraser@apple.com>"> <span class="fn">Simon Fraser (smfr)</span></a>
</span></b>
<pre>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.</pre>
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