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Re: [whatwg] High-density canvases

From: Robert O'Callahan <robert@ocallahan.org>
Date: Sat, 28 Jun 2014 10:42:02 +1200
Message-ID: <CAOp6jLZNGTVXYLpRM6jrPNuHtjK7srpQj8CPEiMqirFgYqYQng@mail.gmail.com>
To: Justin Novosad <junov@google.com>
Cc: Rik Cabanier <cabanier@gmail.com>, Kenneth Russell <kbr@google.com>, Stephen White <senorblanco@chromium.org>, WHAT Working Group <whatwg@whatwg.org>, Dean Jackson <dino@apple.com>, Ian Hickson <ian@hixie.ch>
On Sat, Jun 28, 2014 at 3:41 AM, Justin Novosad <junov@google.com> wrote:

> Example of a problematic renderedsizechange event listener:
>
> canvas.width = Math.floor(canvas.renderedPixelWidth * myPixelScale);
> canvas.height = Math.floor(canvas.renderedPixelHeight * myPixelScale);
>

I don't know why anyone would actually want to do this.

This behavior seems sound at first glance, but because that arithmetic may
> induce a change to the intrinsic aspect ratio due to rounding, step 3) may
> not jump out of the loop during the second iteration, thus allowing the
> feedback loop to keep spinning.
>

What are the specified values of CSS 'width' and 'height' on the canvas in
your example?

Rob
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Received on Friday, 27 June 2014 22:42:27 UTC

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