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[filter-effects] additive animation of filter functions

From: Cameron McCormack <cam@mcc.id.au>
Date: Fri, 23 Aug 2013 11:09:15 +1000
Message-ID: <5216B63B.7020305@mcc.id.au>
To: "public-fx@w3.org" <public-fx@w3.org>
During the SVG telcon this morning, we talked about what it would mean 
to allow additive animation of filter functions in the 'filter' 
property, and I said I would send a mail with some more details (this is 
my ACTION-3520).

Remember that "additive animations" in SVG are those that layer on top 
of other animations for the same attribute/property.  So if you had:

   <animate attributeName="filter" dur="10s"
            values="grayscale(0.5) blur(0px); grayscale(1) blur(4px)"/>
   <animate attributeName="filter" dur="10s"
            values="opacity(1); opacity(0.5)" additive="sum"/>

what is the animated value of 'filter' at a given point during the 

I think it makes sense for the "adding" operation to be "concatenate the 
lists".  So the value at t=5s would be:

   grayscale(0.75) blur(2px) opacity(0.75)
Received on Friday, 23 August 2013 01:09:49 UTC

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