Re: [compositing-1] please move non-separable effects to Level 2

On Sat, Apr 19, 2014 at 5:38 PM, Dean Jackson <dino@apple.com> wrote:

> We support them in software mode too, just not in compositing mode. Since
> we don’t want to have blending disappear if an element becomes composited
> (99.9% of developers would not be able to explain all the cases in which
> this could happen), we’d only ship an implementation that supports them
> everywhere.
>

In Gecko, blending doesn't disappear, instead we prevent the content from
being offloaded to the compositor. So we support them everywhere, but they
cause performance degradation in some cases.

I'll note that Safari 6 release notes claim support for SVG filters. I'm
pretty sure you can implement all the blend modes in terms of SVG filters.
So either Webkit's SVG filter support is partial (in which case partial
support for mix-blend-mode should be OK too right?) or whatever
implementation tradeoffs you made for SVG filters you're declining to make
for mix-blend-mode (which I think is not accurately described as "can't
implement").

Rob
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