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Re: How much background content gets blurred by feGaussianBlur

From: Boris Zbarsky <bzbarsky@MIT.EDU>
Date: Sun, 30 Oct 2011 14:20:35 -0400
Message-ID: <4EAD9573.2070009@mit.edu>
To: www-svg@w3.org
On 10/30/11 12:00 PM, David Dailey wrote:
> Firefox redraws the blurred ellipses dynamically; Chrome waits until
> mouseup to redraw; Opera requires a refresh; ASV doesn’t understand the
> relative coordinates and hence doesn’t redraw at all.
>
> Is that something the spec addresses?

I may be biased, but it seems to me that if the spec describes the 
static rendering and does not explicitly define how it changes 
dynamically then the correct conceptual behavior is that any time any of 
the inputs to the rendering algorithm changes the whole thing is 
rerendered.  This is the behavior that browsers should pretend is taking 
place (in reality, of course, the optimize away as much of the "redoing 
the work" aspect as they can).

So unless the spec explicitly says otherwise, the Firefox behavior seems 
most correct to me, with WebKit's being maybe barely acceptable.

-Boris
Received on Sunday, 30 October 2011 18:21:12 GMT

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