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Re: Canvas in SVG, was: Re: minutes, SVG WG Seattle F2F 2011 day 1

From: Charles Pritchard <chuck@jumis.com>
Date: Fri, 29 Jul 2011 12:17:40 -0700
Message-ID: <4E330754.6080305@jumis.com>
To: Boris Zbarsky <bzbarsky@MIT.EDU>
CC: www-svg@w3.org
On 7/29/2011 8:03 AM, Boris Zbarsky wrote:
> On 7/29/11 9:04 AM, Alex Danilo wrote:
>> *<canvas>  in SVG defaults to retained mode, i.e. we can have an 
>> attribute
>>     or property retain="retain|discard" that controls what happens to 
>> the
>>     drawing commands on the canvas when resize/zoom occurs.
> As proposed (using a replay buffer) this can very easily leak to 
> effectively leaking lots of memory for the page lifetime, and would 
> for most canvas uses I've seen, unless browsers implement complicated 
> heuristics to detect when they can drop things from the buffer because 
> the entire area covered by them has since been painted over with 
> opaque colors.
> As an implementor I would be very wary of implementing this, assuming 
> I were willing to do it at all...

And it still turns foul when dealing with ImageData-based filters.

I think we may most -easily- be able to get Canvas into SVG by 
restricting it to the defs as other paint servers are.
As for resolution management, I think that's something that the author 
will have to manage.

Canvas, unlike other tags, requires that the viewer have scripting enabled.
Fallback paint servers should be considered.

Received on Friday, 29 July 2011 19:18:20 UTC

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