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Re: [whatwg] High-density canvases

From: Robert O'Callahan <robert@ocallahan.org>
Date: Thu, 26 Jun 2014 10:10:56 +1200
Message-ID: <CAOp6jLaYrmcih_VALSibFnC92UJtdnPM4mAdRHsthWr8G0pMAQ@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 Thu, Jun 26, 2014 at 2:49 AM, Justin Novosad <junov@google.com> wrote:

> I was wondering if there is anything we can do with this feature to prevent
> web apps from creating layout feedback loops.  What I mean is that if the
> event listener for renderedsizechange changes the layout of the page in a
> way that does not preserve renderedPixelWidth/Height, we can get into a lot
> of trouble. Even if the resizing arithmetic in the event listener is sound,
> if the rounding logic does not match exactly what the browser does,
> fractional scales may cause instabilities.
>
> The main source of of the problem is that intrinsic size affects CSS size
> when width or height are set to 'auto', which is the default.  Some ideas
> that come to mind for breaking the feedback loop:
> 1) renderedPixelWidth/Height return the intrinsic size when CSS
> width/height are set to 'auto'
> 2) renderedPixelWidth/Height do not change when CSS width/height are set to
> 'auto'
>

We could do this and I think it would work. It's arguable whether the
complexity is justified, but I'd be OK with doing it.

Rob
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Received on Wednesday, 25 June 2014 22:11:22 UTC

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