rekola
commented
7 years ago https://www.cairographics.org/cookbook/blur.c/ http://stevehanov.ca/blog/index.php?id=53 https://dxr.mozilla.org/mozilla2.0/source/gfx/thebes/gfxBlur.cpp https://searchcode.com/codesearch/view/4535507/ http://trac.webkit.org/browser/trunk/WebCore/platform/graphics/qt/ContextShadow.cpp?rev=67559 http://incubator.quasimondo.com/processing/fast_blur_deluxe.php
Currently when shadows are drawn manually, a very slow version of blur is used.