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Re: [whatwg] CSS Filter Effects for Canvas 2D Context

From: Robert O'Callahan <robert@ocallahan.org>
Date: Thu, 26 Jul 2012 17:18:09 +1200
Message-ID: <CAOp6jLYTjpEf=wMefd-g9Z=tbwAcrnmAc23tuJ_hdPaecRCZFA@mail.gmail.com>
To: Rik Cabanier <cabanier@gmail.com>
Cc: "Tab Atkins Jr." <jackalmage@gmail.com>, Ronald Jett <rjett@level-studios.com>, Ashley Gullen <ashley@scirra.com>, "whatwg@whatwg.org" <whatwg@whatwg.org>, David Geary <david.mark.geary@gmail.com>, Chris Marrin <cmarrin@apple.com>
On Tue, Jul 17, 2012 at 4:34 PM, Rik Cabanier <cabanier@gmail.com> wrote:

> I agree that it would be great to have filter effects in Canvas. It should
> be fairly efficient if you have a GPU backend since the effects can all be
> done with shaders so it should take up too much memory.
> This workflow could even support our CSS shaders proposal. Also since CORS
> is no longer an issue with Canvas, we could remove all the limitations we
> had to build in to ensure security.

CORS is still an issue. You would have to apply the same limitations when
using non-origin-clean source images.

Something like canvas.filter = <CSS-filter-value> would probably be good,
but you'd have to define what the object bounding box for SVG filters is.
This would be useful for Shumway.

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Received on Thursday, 26 July 2012 05:18:38 UTC

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