Re: [CSS4 color][CSS4 transition] color pre-multiplied vs non pre-multiplied was (Re: [CSSWG] Minutes TPAC Tue 2012-10-30 AM I: Abstract Directions, Transforms, Transitions)

On Fri, Feb 1, 2013 at 6:50 AM, Brad Kemper <brad.kemper@gmail.com> wrote:

> On Jan 31, 2013, at 11:18 PM, Simon Fraser <smfr@me.com> wrote:
>
> > We rely on Core Graphics to render gradients on Mac, and that can't do
> pre-multiplied. That's the main reason why gradients don't match
> transitions.
>
> If I understand correctly, this means that if an author wants a nice
> clean-looking 3-stop gradient that goes from yellow to transparent to blue,
> he will have to use two same-position transparent color stops, so that it
> is actually yellow to transparent-yellow, and then transparent-blue to
> blue. Couldn't WebKit just perform this extra conversion step for us before
> passing it on to Core Graphics?


This is why I would do under the hood.

Rik