[whatwg] Canvas operators (was Re: several messages)

[Ian Hickson]

On Wed, 16 Jan 2008, Krzysztof Żelechowski wrote:
> Dnia 16-01-2008, Śr o godzinie 02:48 +0000, Ian Hickson pisze:
> > On Sun, 20 May 2007, ddailey wrote:
> > > Another question arises in my mind in this context: is there any reason 
> > > that any of the treatments of these effects (like the Porter-Duff 
> > > operators, darken, saturate etc.) should be any different than they are 
> > > in the SVG spec? So many things that I see in the treatment of canvas 
> > > remind me of something so similar to what is in SVG that it makes me 
> > > wonder why not just reference say http://www.w3.org/TR/SVG/filters.html 
> > > ?
> > 
> > The <canvas> globalCompositeOperation is just defined in terms of 
> > PorterDuff, which far predates SVG.
> 
> And why does the canvas specification have to pretend that it predates 
> SVG too?

It doesn't, particularly, but it seems simpler to reference the original 
paper than to reference a document that itself references that paper.

-- 
Ian Hickson               U+1047E                )\._.,--....,'``.    fL
http://ln.hixie.ch/       U+263A                /,   _.. \   _\  ;`._ ,.
Things that are impossible just take longer.   `._.-(,_..'--(,_..'`-.;.'