Re: [filter-effects] resolution dependent filter primitives

On 28 August 2013 16:38, Dirk Schulze <dschulze@adobe.com> wrote:

> > Is the blurring following the rotation or does it stay in the horizontal
position?

The latter.  The blur is applied to the transformed object, so even if
stdDevation.Y is 0, you still get blurring in the "Y" direction.

Paul




On 28 August 2013 16:38, Dirk Schulze <dschulze@adobe.com> wrote:

>
> On Aug 28, 2013, at 6:11 AM, Paul LeBeau <paul.lebeau@gmail.com> wrote:
>
> >
> > On 27 August 2013 20:42, Dirk Schulze <dschulze@adobe.com> wrote:
> > Again, it is extremely hard to determine the right scale level for the
> horizontal and vertical axis...
> >
> > As someone who is implementing filter support in my renderer at the
> moment, I can concur with this :)
> >
> > It would be helpful if the spec gave some guidance on best practice for
> determining an appropriate size for the filter bitmap.  By "filter bitmap"
> I mean the intermediate bitmap used for SourceGraphic etc.  For axis
> aligned content it is easy, but if the element has a transform, it is not
> so straightforward.
>
> I actually planned to discuss that in a different threat. I agree with you
> on that and invite implementers to give feedback on how they estimate the
> affected area in screen coordinates. I will do so for WebKit shortly.
>
> >   In fact I notice that IE doesn't even try. It performs all filters on
> the transformed content and doesn't use user-coordinate-space.
>
> I never really experimented with filters in IE so far. I wonder how that
> works with gaussian blur and a horizontal blur radius on a rotated object.
> Is the blurring following the rotation or does it stay in the horizontal
> position?
>
> Greetings,
> Dirk
>
> >
> > Paul
> >
>
>