Re: [css-compositing] blending in canvas

On Thu, Nov 15, 2012 at 3:47 PM, Tab Atkins Jr. <jackalmage@gmail.com>wrote:

> On Thu, Nov 15, 2012 at 3:40 PM, Rik Cabanier <cabanier@gmail.com> wrote:
> > On Thu, Nov 15, 2012 at 2:46 PM, Tab Atkins Jr. <jackalmage@gmail.com>
> > wrote:
> >> I like option 4, actually.  The existing blending/compositing
> >> properties have pretty long names (and the names use inconsistent
> >> conjugation, which is a bug that should be fixed).
> >
> > Is the the -ing of alpha-compositing vs blend-mode?
> > If so, I will fix the spec.
>
> Yes.  We generally avoid gerunds in our property names.  Don't know if
> I want to bikeshed, but what about alpha-blend-mode and
> color-blend-mode? Or, if we add a 'mix' shorthand, 'mix-alpha' and
> 'mix-color'?
>
> I know we want to be familiar to people who have experience with these
> abilities from elsewhere, but it's also important to keep things
> consistent within CSS, and following CSS's general naming conventions.
>  When we don't do that (to match some outside convention), it usually
> looks like a mistake a few years later, when everyone knows about the
> CSS properties.
>

That sounds like a plan.
I like 'mix', 'mix-alpha' and 'mix-color' and will update the spec (unless
I hear objections)


> >> They'll usually be
> >> set together, but I can see use-cases for animating them separately.
> >> This suggests a shorthand property.
> >>
> >> The email Dirk just sent, where he proposes an at-rule for defining
> >> custom filters, uses the name "mix" for a descriptor that sets both
> >> blending and compositing at the same time.  I don't know if it's too
> >> short, but I like it.
> >
> >
> > Are you suggesting a new css keyword 'mix: blend-mode composite-mode' or
> a
> > new value for a css keyword that combines compositing and blending?
> > So:
> >
> > alpha-compositing: <compositing mode>
> > blend-mode: <blend mode>
> > mix: <blend mode>  <compositing mode>  <- matches canvas'
> > globalCompositeOperator
>
> This one.  You could combine 'knockout' and 'isolation' into the shorthand
> too.


Cool.
I will then have to document that 'knockout' and 'isolation' don't do
anything in canvas.

Rik