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Re: Margins for filters?

From: Erik Dahlstrom <ed@opera.com>
Date: Sat, 17 Apr 2010 17:00:17 +0200
To: "Jasper van de Gronde" <th.v.d.gronde@hccnet.nl>, www-svg@w3.org
Message-ID: <op.vbbamrzcgeuyw5@erik-dahlstroms-macbook-pro-2.local>
On Sat, 17 Apr 2010 10:45:28 +0200, Jasper van de Gronde  
<th.v.d.gronde@hccnet.nl> wrote:

> For a blur (as well as some other filters) it is useful to make the  
> filter effects region larger than the bounding box of the object.  
> However, this requires the region to larger by a fixed number of pixels  
> (in user space coordinates), instead of being a multiple of the bounding  
> box. (This was in fact the root cause of a bug reported for Inkscape,  
> where a blur would disappear for a completely horizontal/vertical line.)
>
> I am aware of the possibility to specify userSpaceOnUse and explicitly  
> state the region required to show the blur (and am considering using it,  
> also because it would allow us to consider stroke). But this has the  
> disadvantage that it only works for a specific object, being able to  
> specify a margin would make it much easier to define reusable blur  
> filters.
>
> So, is there some way to specify a "margin" for the filter effects  
> region?

There is in the SVG Filter 1.2 working draft (attributes 'mx', 'my', 'mw',  
'mh'), for details see the latest editors draft:  
http://dev.w3.org/SVG/modules/filters/publish/SVGFilter.html#FilterPrimitiveSubRegion

Feedback on that would be most welcome.

Cheers
/Erik

-- 
Erik Dahlstrom, Core Technology Developer, Opera Software
Co-Chair, W3C SVG Working Group
Personal blog: http://my.opera.com/macdev_ed
Received on Saturday, 17 April 2010 15:01:03 GMT

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