- From: SVG Working Group Issue Tracker <sysbot+tracker@w3.org>
- Date: Wed, 23 Jun 2010 08:08:02 +0000
- To: public-svg-wg@w3.org
ISSUE-2334: filter primitive subregion and feGaussianBlur, feTile and infinite filter input images [SVG 1.1 F2 Last Call] http://www.w3.org/Graphics/SVG/WG/track/issues/2334 Raised by: Erik Dahlström On product: SVG 1.1 F2 Last Call It seems unclear what the effect of the filter primitive subregion is on feGaussianBlur (and other kernel-based primitives such as feConvolutionMatrix). The 1.1 spec says > All filter primitives have attributes *x*, *y*, *width* and *height* which identify a subregion which restricts calculation and rendering of the given filter primitive. "Restricts calculation" is a bit ambiguous. Does this mean: -- The implementation takes a snapshot of the input image, with the geometry of the snapshot determined by the filter primitive subregion for the feGaussianBlur, and performs processing on that, treating the boundaries of the snapshot as the boundary where boundary conditions are applied. or something else? BTW the spec also says > If the input has infinite extent and is a tile, the filter is evaluated with periodic boundary conditions. I'm not sure what it means for the input to have infinite extent in this context, and I'm not sure what it means to be "a tile". Does it mean that the input is an feTile? Could this be more precisely defined? Original mail: http://www.w3.org/mid/AANLkTingLaPxHAuQQsNZI2L-EUnwtaHtAgkqulWIRkzs@mail.gmail.com http://lists.w3.org/Archives/Public/www-svg/2008May/0013.html
Received on Wednesday, 23 June 2010 08:08:03 UTC