Re: [filters] notes to CSS filters

On Thu, Sep 22, 2011 at 10:15 PM, Dirk Schulze <vbs85@gmx.de> wrote:

> For the current CSS shorthand filter effects it is quite easy to omit
> filter regions. The implementations can calculate the boundaries
> themselves. What is the status on the SVG part? Do we find a way to limit
> the filter region size automatically?


Yes.


> Right now one of the filter effects that can have unlimited size is
> lightning (same for feTurbulence IIRC).
> However, Firefox limits the size of a lighting effect automatically! You'll
> see that if you compare the example [3] between Firefox and Chrome/Opera.
> The size of the filter result on Firefox is smaller. Even if it is a bug in
> Firefox at the moment, we could add a rule to the filter specification that
> would specify this behavior. Once we've done that, we can omit filterRegions
> (or make it optional) and don't need to auto clip to (-10%, -10%, 120%,
> 120%) anymore.
> (Firefox takes the size of the previous filter effect and uses the same
> size for the lighting effect if no subregion was specified).
>

That's a bug. Maybe we don't need to do anything in the spec; if primitive
regions are not specified the unbounded primitives can just fill the entire
visible (clipped) area.

Rob
-- 
"If we claim to be without sin, we deceive ourselves and the truth is not in
us. If we confess our sins, he is faithful and just and will forgive us our
sins and purify us from all unrighteousness. If we claim we have not sinned,
we make him out to be a liar and his word is not in us." [1 John 1:8-10]