- From: Stephen Chenney <schenney@chromium.org>
- Date: Tue, 24 Sep 2013 12:01:43 -0400
- To: Paul LeBeau <paul.lebeau@gmail.com>
- Cc: Dirk Schulze <dschulze@adobe.com>, "www-svg@w3.org" <www-svg@w3.org>, "public-fx@w3.org" <public-fx@w3.org>
- Message-ID: <CAObCcUrummkWhEfA22NXkv2SieWLRhe1QBJ6t1iJS23KJ3YWFA@mail.gmail.com>
On Wed, Aug 28, 2013 at 1:02 AM, Paul LeBeau <paul.lebeau@gmail.com> wrote: > 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 > Surely this is because they apply the blur to the frame-buffer target in hardware (not to a render target that is subsequently applied as texture to a transformed quad). Stephen. > 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 >> > >> >> >
Received on Tuesday, 24 September 2013 16:03:10 UTC