- From: Tab Atkins Jr. <jackalmage@gmail.com>
- Date: Sat, 30 Mar 2013 08:05:44 -0700
- To: Dirk Schulze <dschulze@adobe.com>
- Cc: "public-fx@w3.org" <public-fx@w3.org>, Dean Jackson <dino@apple.com>, Alexandru Chiculita <achicu@adobe.com>
On Sat, Mar 30, 2013 at 7:28 AM, Dirk Schulze <dschulze@adobe.com> wrote: > Hi, > > Currently the drop-shadow shorthand filter does not support inset shadows and the inset keyword (in comparison to box-shadow for instance). I wonder if this could be added to the spec and would like to hear implementers input. > > Most shorthands have the advantage that they can easily be HW accelerated. This already seems not always be the case for drop-shadow on some platforms. However, I do not think that it is harder to implement inset shadow, even if it will be of course slower than other filters. > > Here is a short example how to use inset shadows with SVG Filters today[1]: > > <filter id="innershadow" x0="-50%" y0="-50%" width="200%" height="200%"> > <feGaussianBlur in="SourceAlpha" stdDeviation="2" result="blur"/> > <feOffset dy="3" dx="3"/> > <feComposite in2="SourceAlpha" operator="arithmetic" > k2="-1" k3="1" result="shadowDiff"/> > <feFlood flood-color="black" flood-opacity="1"/> > <feComposite in2="shadowDiff" operator="in"/> > <feComposite in2="SourceGraphic" operator="over"/> > </filter> > > Implementations could replace the inset shadow in the CSS string with an equivalent filter chain as above. > > Greetings, > Dirk > > [1] http://ledrug.wordpress.com/2010/09/30/learning-svg-lesson-2/ +1, and it would also be nice to support spread, if that's possible to do in filters. ~TJ
Received on Saturday, 30 March 2013 15:06:31 UTC