[Webkit-unassigned] [Bug 88877] SVG Lightning filter effects incorrect under zoom

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=88877





--- Comment #3 from Dirk Schulze <krit at webkit.org>  2012-06-12 20:05:54 PST ---
(In reply to comment #2)
> http://www.w3.org/TR/SVG/filters.html#feDiffuseLightingElement Because they operate on pixels, such filters are inherently resolution-dependent. To make ‘feDiffuseLighting’ produce resolution-independent results, an explicit value should be provided for either the ‘filterRes’ attribute on the ‘filter’ element and/or attribute ‘kernelUnitLength’.
> 
> The testsuite test doesn't set these attributes so zooming in is likely to result in at least an intensity change depending on how it's implemented in Webkit.

At the moment the light source position is transformed by using wrong transformations. That causes the issue. This is a known bug, that we have since filters render pixel perfect. FF handles this case correctly.

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