- From: Alan Gresley <alan@css-class.com>
- Date: Sun, 03 Feb 2013 04:01:48 +1100
- To: Brad Kemper <brad.kemper@gmail.com>
- CC: Simon Fraser <smfr@me.com>, Rik Cabanier <cabanier@gmail.com>, fantasai <fantasai.lists@inkedblade.net>, "www-style@w3.org" <www-style@w3.org>
On 2/02/2013 1:50 AM, Brad Kemper 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? It still won't work. A pre-multiplied gradient of yellow to transparent to blue is not the same as a non pre-multiplied gradient of yellow to transparent-yellow, and then transparent-blue to blue. That is why I have suggested pre-transparent (or pm-transparent) as a way to do this when support for pre-multiplied gradients is universal. -- Alan Gresley http://css-3d.org/ http://css-class.com/
Received on Saturday, 2 February 2013 17:02:19 UTC