Why not just have {"src": "...", "scalable": true} and let the UA figure it
out. If it's a bitmap, try and scale it anyway (it'll be blurry, but that's the
dev's fault). If the UA doesn't get scalable for any of the icons, it shouldn't
scale them (unless none of them are the size it needs, in which case it should
pick the closest size up and scale down or the nearest size down and scale up).
----- Original Message -----
From: "Marcos Caceres" <mcace...@mozilla.com>
To: "Mounir Lamouri" <mou...@lamouri.fr>
Cc: "dev-webapps" <dev-webapps@lists.mozilla.org>, "Vivien Nicolas"
<vnico...@mozilla.com>, "Jonas Sicking" <jo...@sicking.cc>, "Tim Guan-tin
Chien" <timdr...@mozilla.com>
Sent: Wednesday, June 19, 2013 6:02:03 AM
Subject: Re: Icon sizes and display densities
On Wednesday, 19 June 2013 at 10:58, Mounir Lamouri wrote:
> On 18/06/13 17:40, Marcos Caceres wrote:
> > I'm not sure I follow? If you have:
> >
> > {src: "foo", width: "64", height: "64", type: "image/svg"}
> >
> > The UA assumes that the generated content is going to be "image/svg"?… more
> > below.
>
> Yes. But what if the icon might be a bitmap format or a vectorial format
> depending on some parameters?
If the parameters are expressed explicit through the URL, then one declares two
or more icons:
{src: "foo?format=svg", width: "64", height: "64", type: "image/svg"}
{src: "foo?format=jpeg", width: "64", height: "64", type: "image/jpeg"}
{src: "foo?format=webp", width: "64", height: "64", type: "image/webp"}
In the case where the type is server determined (e.g., content negotiation or
UA string), the developer is basically agreeing to deal with it, So the
following is still ok:
{src: "foo?format=random", width: "64", height: "64"}
The content negotiation case can be problematic (for devs) as UAs basically say
"I'll accept anything you got!" (image/* and */*) in the Accept header for
image requests. See:
https://developer.mozilla.org/en-US/docs/HTTP/Content_negotiation#Values_for_an_image
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