Re: SVG API for canvas

On Mon, Jun 9, 2014 at 6:55 PM, David Dailey <ddailey@zoominternet.net>
wrote:

> Hi Rik,
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> Your link here, elicits a couple of questions for me. Perhaps the
> questions are better directed to the maintainers of the project. (In which
> case yet other questions might emerge, about things one might want to do
> with SVG and canvas and why we can’t (without such a library) at present.)
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> 1.       When it talks about doing SVG animation, how does it compare
> currently to, say FakeSMIL or SMILScript. We’ve been interested in some of
> the parsing involved, since <replicate> parallels and extends much of
> <animate> and being able to robustly parse all the nuances of <animate> is
> of interest – and of course there are some who would like animate to be
> able to play in IE;) A robust JavaScript library to do that would be handy,
> particularly if it could just parse out <animate> whenever it is
> encountered in IE.  JavaScript timing  doesn’t seem to be as smooth as
> SMIL, but in a vacuum, little things are often welcome.
>
I don't know. Maybe the owner of canvg can answer that.
However, requestAnimationFrame should result in smoother animation than
SMIL.

> 2.       I recall that there was a security thing, at least for a while,
> where we were not allowed to read the pixels back out of an SVG for fear
> that someone might read privileged pixels of some sort. Does canvg resolve
> that issue? In particular can one use it to read the pixels from an SVG?
> There are lots of reasons for doing this dating back a decade or so, but
> I’d have to mull awhile over what some of those might have been. I know
> that other folks have been interested in doing it, too,  so it is not just,
> “academic.”  Does the security issue still exist? I’ve heard former
> Adobeans claim that they are doing it.
>

yes, from the main page:

Allows for SVG -> Canvas -> png transition all on the client side (through
toDataUrl
<http://www.w3.org/TR/html5/the-canvas-element.html#dom-canvas-todataurl>)


As long as the input is all from the same domain (or CORS is setup
correctly), you should be able to read the pixels from the canvas.

> 3.       When the proprietors of Canvg say “Tested in Chrome, Firefox,
> Opera, and IE (through FlashCanvas)” do the parentheses apply only to IE?
>

Yes, that's likely for version of IE that didn't support canvas.


> *Cc:* <www-svg@w3.org>
> *Subject:* Re: SVG API for canvas
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> On Sun, Jun 8, 2014 at 1:58 PM, Emanuel <emanuelpallen@yahoo.com> wrote:
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> SVG API for canvas. I feel SVG would be a great contribute to canvas
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> see https://code.google.com/p/canvg/
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