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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)

From: Rik Cabanier <cabanier@gmail.com>
Date: Fri, 1 Feb 2013 08:34:37 -0800
Message-ID: <CAGN7qDCo4GgQ03vcT6paUNwAm4bgw6UtgpS3GnsvXapqJ+d6cg@mail.gmail.com>
To: Brad Kemper <brad.kemper@gmail.com>
Cc: Simon Fraser <smfr@me.com>, Alan Gresley <alan@css-class.com>, fantasai <fantasai.lists@inkedblade.net>, "www-style@w3.org" <www-style@w3.org>
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.

Received on Friday, 1 February 2013 16:35:04 UTC

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