[Webkit-unassigned] [Bug 136482] Filters have weird clipping on compositing tile borders

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=136482





--- Comment #1 from Dirk Schulze <krit at webkit.org>  2014-09-03 07:46:36 PST ---
(In reply to comment #0)
> On compositing tiles, filters are clipped and refiltered. This has really strange effects on gaussian blur filters. See the example at http://codepen.io/adobe/pen/eJHgl move the slider for the bottom iframe up and down.

A static tile grid doesn't work great for many SVG filters. There will always be situations where feDisplacementMap, feDropShadow, lightning filters, feGaussianBlur need pixels from different tiles. For feDisplacementMap it can even be hard to impossible to predict the exact area of possibly requested pixels.

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