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

From: Rik Cabanier <cabanier@gmail.com>
Date: Tue, 21 Oct 2014 15:39:10 -0700
Message-ID: <CAGN7qDDge5iadUM7Fn=yP2dUbagyhmBCysywMs+OfW-CtL1Vag@mail.gmail.com>
To: Dirk Schulze <dschulze@adobe.com>
Cc: FX <public-fx@w3.org>, Stephen Chenney <schenney@chromium.org>
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
Received on Tuesday, 21 October 2014 22:39:37 UTC

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