[webkit-dev] Adding blending mode to WebKit canvas

Maciej Stachowiak mjs at apple.com
Wed Nov 14 13:37:43 PST 2012

On Nov 14, 2012, at 8:33 AM, Rik Cabanier <cabanier at gmail.com> wrote:

> On Tue, Nov 13, 2012 at 11:19 PM, Maciej Stachowiak <mjs at apple.com> wrote:
> On Nov 13, 2012, at 4:43 PM, Rik Cabanier <cabanier at gmail.com> wrote:
>> Maciej,
>> did this sound reasonable to you?
> Still doesn't make sense to me. Even if we don't implement CSS 'alpha-compositing' and 'blend-mode' today, I assume we will want to implement them eventually. At that point we will want them consistent with Canvas. If the only reason to combine compositing operator and blend modes is short-term ease of implementation on Mac, then that doesn't seem like a great reason to make the Web platform permanently inconsistent.
>> Would you object if Canvas combines blending and compositing but not CSS?
> Yes. I think they should be consistent and the relevant standards group (FX Task Force?) should decide. It's not even very important to me which is chosen. It just seems arbitrary that they would make different choices on this, especially when it is all defined in the same spec.
> Thanks Maciej!
> I will bring this up on the FX mailing list.
> Depending on the outcome, I will amend the compositing spec.

Thanks, that would be much appreciated.


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