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Re: Some filter effects specification review comments

From: Erik Dahlstrom <ed@opera.com>
Date: Fri, 17 Jun 2011 15:34:29 +0200
To: "public-fx@w3.org" <public-fx@w3.org>, "Vincent Hardy" <vhardy@adobe.com>
Message-ID: <op.vw72nr2egeuyw5@localhost.localdomain>
On Fri, 17 Jun 2011 15:02:32 +0200, Vincent Hardy <vhardy@adobe.com> wrote:

> Hit testing
> https://dvcs.w3.org/hg/FXTF/raw-file/tip/filters/publish/Filters.html#filte
> rs-in-css
> The filter is defined to have no effect on hit testing when clicking into
> the final rendered image. This is a concern: highly distorting filters
> will basically create situations where the hit testing is completely at
> odds with what the viewer sees. For example, in an extreme case, a filter
> can blow away the image entirely, but it will still respond to hit
> testing. Has the group discussed possible solutions to this problem?

A concern that's been mentioned before is that it can be expensive to  
evaluate filters for hit-testing. However, just taking the region that was  
affected by a given filter could work performance-wise. Unfortunately that  
region can be visually empty too depending on the input and what filterops  
were used (e.g make something almost fully transparent).

Erik Dahlstrom, Core Technology Developer, Opera Software
Co-Chair, W3C SVG Working Group
Personal blog: http://my.opera.com/macdev_ed
Received on Friday, 17 June 2011 13:35:05 UTC

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