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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 GMT

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