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Re: Filter Templates

From: Robert O'Callahan <robert@ocallahan.org>
Date: Fri, 25 Feb 2011 15:15:07 +1300
Message-ID: <AANLkTikqTKBFJXzqWR9Zc+SkSrmSx7U37+RkKiYNPi-Q@mail.gmail.com>
To: Alex Danilo <alex@abbra.com>
Cc: Anthony Grasso <Anthony.Grasso@cisra.canon.com.au>, Dean Jackson <dino@apple.com>, Alistair MacDonald <al@bocoup.com>, Rik Cabanier <cabanier@gmail.com>, Rik Cabanier <cabanier@adobe.com>, Cameron McCormack <cam@mcc.id.au>, Brad Kemper <brad.kemper@gmail.com>, www-style list <www-style@w3.org>, "public-fx@w3.org" <public-fx@w3.org>
On Fri, Feb 25, 2011 at 12:53 PM, Alex Danilo <alex@abbra.com> wrote:

> Ignoring side-effects, one of the main advantages of a property
> over a filter is no need for any sort of intermediate bitmap.
>
> The object being blended can be rasterized and alpha blended
> with the correct blend mode directly to the canvas. So the
> performance is significantly higher, especially if you are
> trying to composite lots of graphics on top of live HD video
> where memory bandwidth actually matters.
>

That optimization can be done whether you're using a filter or a dedicated
property.

Rob
-- 
"Now the Bereans were of more noble character than the Thessalonians, for
they received the message with great eagerness and examined the Scriptures
every day to see if what Paul said was true." [Acts 17:11]
Received on Friday, 25 February 2011 02:17:19 GMT

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