Re: [css-compositing] 'destination' compositing mode in Canvas?

On Tue, Oct 21, 2014 at 12:21 PM, Dirk Schulze <dschulze@adobe.com> wrote:

> Hi,
>
> Stephen from Blink noted that the compositing mode ‘destination’[1] was
> not implemented in Blink. I checked other browsers and in fact it doesn’t
> seem to be implemented anywhere.
>
> Since ‘destination’ doesn’t seem to be very useful, I wonder if browsers
> should spend the efforts to implement this compositing mode, or if we
> should drop it from the supported compositing modes on Canvas’s
> globalCompositeOperation attribute.
>
> Implementing it just because it is one of the Porter-Duff modes doesn’t
> seem to legitimate the efforts IMO. What do others think? Were there
> request to support this compositing mode?
>

I believe this was added to reflect the comp-op property of the old SVG
compositing spec [1].
I agree it's not a useful propery so it's fine to remove it.

1: http://www.w3.org/TR/2009/WD-SVGCompositing-20090430/#comp-op