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Re: [whatwg] Why does CanvasRenderingContext2D.drawImage not draw a video's poster?

From: Mark Callow <callow_mark@hicorp.co.jp>
Date: Thu, 19 Jul 2012 13:14:26 +0900
Message-ID: <500789A2.3020806@hicorp.co.jp>
To: "whatwg@lists.whatwg.org" <whatwg@lists.whatwg.org>
On 18/07/2012 13:57, Charles Pritchard wrote:

> We don't have events based on poster, so we don't know whether or not it's been loaded.

On 19/07/2012 09:46, Charles Pritchard wrote:
> I'm not opposed to the idea, but I'm failing to see the benefit.
> Still, if there's going to be one, we're going to need an
> onposterloaded event.

I don't understand these concerns. Step 4 of the algorithm to be run
when the video element is created or the @poster attribute is set,
changed or removed says:

    Fetch
    <http://www.whatwg.org/specs/web-apps/current-work/multipage/fetching-resources.html#fetch>
    the resulting absolute URL
    <http://www.whatwg.org/specs/web-apps/current-work/multipage/urls.html#absolute-url>,
    from the element's |Document
    <http://www.whatwg.org/specs/web-apps/current-work/multipage/dom.html#document>|'s
    origin
    <http://www.whatwg.org/specs/web-apps/current-work/multipage/origin-0.html#origin>.
    This must delay the load event
    <http://www.whatwg.org/specs/web-apps/current-work/multipage/the-end.html#delay-the-load-event>
    of the element's document.

So once the documented is loaded, the poster, if there is one, will be
available.

Regards

    -Mark

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Received on Thursday, 19 July 2012 04:14:57 GMT

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