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Re: [css-transitions] Some matrix-based rotation interpolations are "wrong"

From: Rik Cabanier <cabanier@gmail.com>
Date: Mon, 6 May 2013 16:21:28 -0700
Message-ID: <CAGN7qDAVFo-3HDW+TeG9nx6FgVCvAEw3feoAdfOrFoHbXcW9RQ@mail.gmail.com>
To: "Tab Atkins Jr." <jackalmage@gmail.com>
Cc: www-style list <www-style@w3.org>
That's great!

A couple of weeks ago I was trying to figure out why CA was animation a
matrix differently than WebKit.
With your fix, does the testfile of
https://bugs.webkit.org/show_bug.cgi?id=112824 animate the identical in
Safari and Blink?

Rik

On Mon, May 6, 2013 at 4:12 PM, Tab Atkins Jr. <jackalmage@gmail.com> wrote:

> On Mon, May 6, 2013 at 4:02 PM, Rik Cabanier <cabanier@gmail.com> wrote:
> > After this change, will Blink match Safari?
> > If not, Safari can't change its behavior since it relies on the operation
> > system to do animations...
>
> I think so, yes.  We got the "bad" behavior when we switched from
> WebCore::TransformationMatrix to gfx::Transform, according to
> <https://code.google.com/p/chromium/issues/detail?id=236018>.  A quick
> test in Safari with the example code in my first post has it doing the
> short-path animation.
>
> ~TJ
>
Received on Monday, 6 May 2013 23:21:58 UTC

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