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Re: [whatwg] [canvas] inner shadows

From: Ian Hickson <ian@hixie.ch>
Date: Sat, 24 Nov 2012 00:21:03 +0000 (UTC)
To: Rik Cabanier <cabanier@gmail.com>
Message-ID: <Pine.LNX.4.64.1211240020380.29456@ps20323.dreamhostps.com>
Cc: Dirk Schulze <dschulze@adobe.com>, Tyler Larson <talltyler@gmail.com>, Glenn Maynard <glenn@zewt.org>, "whatwg@whatwg.org" <whatwg@whatwg.org>
On Fri, 23 Nov 2012, Rik Cabanier wrote:
> On Fri, Nov 23, 2012 at 4:03 PM, Ian Hickson <ian@hixie.ch> wrote:
> > On Fri, 23 Nov 2012, Rik Cabanier wrote:
> > >
> > > It would still be quite complex to draw an inner shadow this way 
> > > because the blur is calculated on the inverse of the shape. A user 
> > > will need to draw to another canvas and then 'clear' it to get the 
> > > inverse.
> >
> > Turns out it's much easier than that; see my e-mail just now.
> 
> No. You don't want to see a black shadow with blurred edges. For an 
> 'inner' shadow, the shadow image sits outside the shape so you have to 
> calculate that.

I don't follow. Why would you see a black shadow?

Do you have an example of what you mean?

-- 
Ian Hickson               U+1047E                )\._.,--....,'``.    fL
http://ln.hixie.ch/       U+263A                /,   _.. \   _\  ;`._ ,.
Things that are impossible just take longer.   `._.-(,_..'--(,_..'`-.;.'
Received on Saturday, 24 November 2012 03:23:25 GMT

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