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Re: [css-filters-2] Clarify 'backdrop-filter' in circular case

From: Tab Atkins Jr. <jackalmage@gmail.com>
Date: Thu, 13 Aug 2015 15:35:28 -0700
Message-ID: <CAAWBYDBu=McOxPCPAOijdAZmHS27tpYQRNmfUj7U1q2N5Zngjg@mail.gmail.com>
To: Rik Cabanier <cabanier@gmail.com>
Cc: "public-fx@w3.org" <public-fx@w3.org>
On Thu, Aug 13, 2015 at 2:55 PM, Rik Cabanier <cabanier@gmail.com> wrote:
> On Thu, Aug 13, 2015 at 2:46 PM, Tab Atkins Jr. <jackalmage@gmail.com>
> wrote:
>> On Thu, Aug 13, 2015 at 2:29 PM, Rik Cabanier <cabanier@gmail.com> wrote:
>> > On Thu, Aug 13, 2015 at 2:20 PM, Rik Cabanier <cabanier@gmail.com>
>> > wrote:
>> >> You execute an extra pass where you render everything upto your nearest
>> >> sibling, but you ignore any opacity, filters and compositiing.
>> >> Then you use this as input to the backdrop filter.
>> >> http://www.w3.org/TR/SVG/filters.html#EnableBackgroundProperty
>> >> describes
>> >> the algorithm in more details.
>> >>
>> >> This is the same problem that we faced when we planning on introducing
>> >> non-isolated blending. https://codereview.chromium.org/23455060/#msg33
>> >> describes the notes from enne on how to implement this.
>> >
>> > The actual location of the solution is here:
>> > https://codereview.chromium.org/23455060/#msg37
>>
>> Can this algorithm be ported into the actual spec?  There's currently
>> no link from Filters or Compositing to that algorithm, and even if
>> there was, you have to realize the need to translate between
>> 'enable-background' and 'isolation'/all the other properties that
>> cause a stacking context.
>
> It used to be in the css compositing spec, but I was told to take it out
> because there were no implementations at the time.
> I can probably look in the history and add it to a level 2 spec.

Safari's on track to release it in a few weeks, and we intend to
implement, so that would be nice. ^_^

~TJ
Received on Thursday, 13 August 2015 22:36:15 UTC

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