On Wed, Nov 14, 2012 at 1:37 PM, Maciej Stachowiak <m...@apple.com> wrote:
> > On Nov 14, 2012, at 8:33 AM, Rik Cabanier <caban...@gmail.com> wrote: > > > > On Tue, Nov 13, 2012 at 11:19 PM, Maciej Stachowiak <m...@apple.com> wrote: > >> >> On Nov 13, 2012, at 4:43 PM, Rik Cabanier <caban...@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. > > Hi Maciej, I send the question to the fx list. Tab Atkins brought up that we could extend the 'globalCompositeOperator' so it also takes a comma separate list of a blend and a compositing operation. Calling: mycontext.globalCompositeOperator = 'multiply'; would be identical to: mycontext.globalCompositeOperator = 'multiply, source-over'; This would make Canvas support blending and compositing and can be implemented with no compatibility issues later. Does this ease your concern about the difference between Canvas and CSS?
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