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Re: Enabling pixel grabbing in SVG just like Canvas

From: Robert O'Callahan <robert@ocallahan.org>
Date: Sun, 4 Oct 2009 14:34:38 +1300
Message-ID: <11e306600910031834x5492d0d6k968651a94a285cea@mail.gmail.com>
To: Jon Ferraiolo <jferrai@us.ibm.com>
Cc: www-svg@w3.org
On Sun, Oct 4, 2009 at 2:17 PM, Jon Ferraiolo <jferrai@us.ibm.com> wrote:

> At SVG Open, there was discussion today about adding Canvas's pixel
> grabbing APIs to SVG, with claims that SVG implementations don't necessarily
> retain a rendering surface. It now occurs to me that there is a CSS property
> ('enable-background') in the SVG 1.1 spec just for this purpose:
> * http://www.w3.org/TR/SVG/filters.html#AccessingBackgroundImage
> Pixel grabbing APIs in SVG could require that 'enable-background' is placed
> on the outermost <svg> element as a hint to the implementation that it needs
> to retrievable retain pixel values for image.
> Note that implementations pretty much have to implement saved rendering
> surfaces to do group opacity even if they haven't implemented filter effects
> yet.

Why don't we just make it more convenient to render SVG to <canvas> and then
use canvas's getImageData?

"He was pierced for our transgressions, he was crushed for our iniquities;
the punishment that brought us peace was upon him, and by his wounds we are
healed. We all, like sheep, have gone astray, each of us has turned to his
own way; and the LORD has laid on him the iniquity of us all." [Isaiah
Received on Sunday, 4 October 2009 01:35:14 UTC

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