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Re: [css3-images] `image-resolution: span` and transformations.

From: Tab Atkins Jr. <jackalmage@gmail.com>
Date: Mon, 29 Jul 2013 13:08:33 -0700
Message-ID: <CAAWBYDCpKKwJGPNfUWTpY8PvCmYNPr4k_QM==8nF_zHNHep0pQ@mail.gmail.com>
To: Rik Cabanier <cabanier@gmail.com>
Cc: Simon Sapin <simon.sapin@exyr.org>, www-style list <www-style@w3.org>
On Mon, Jul 29, 2013 at 12:40 PM, Rik Cabanier <cabanier@gmail.com> wrote:
> On Mon, Jul 29, 2013 at 4:10 AM, Simon Sapin <simon.sapin@exyr.org> wrote:
>> Le 26/07/2013 18:41, Tab Atkins Jr. a écrit :
>>> On Fri, Jul 26, 2013 at 10:21 AM, Simon Sapin<simon.sapin@exyr.org>
>>> wrote:
>>>>
>>>> Le 26/07/2013 17:56, Tab Atkins Jr. a écrit :
>>>>>
>>>>> I don't think it should.  For one, this would mean that the intrinsic
>>>>> size of an image changes as you transform it, which is clearly not a
>>>>> good result.
>>>>
>>>>
>>>> Your first point also applies to user zoom, especially with mobile-style
>>>> panning zoom. What does "snap" mean in this context?
>>>
>>> No, mobile pinch-zoom is a distinct type of zoom.  We need to
>>> formalize these concepts within CSS, as they're being formalized in
>>> the back-end ad-hocly right now.
>>>
>>> The relevant type of zoom is the one that changes the viewport size.
>>> This changes a bunch of the layout, so it's okay for images to have a
>>> different intrinsic size.
>>
>>
>>
>> Ok. So, to sum up:
>>
>> * Transforms should not affect 'snap'. This makes 'snap' useless on
>> transformed images, but that seems better than the alternative.
>>
>> * "Desktop-type" zoom that changes the size (in CSS units) of the initial
>> containing block should affect 'snap'. That’s fine because layout probably
>> changes anyway.
>
>
> It seems that browser zoom/changing the device pixel ratio should not be
> affected by 'snap'.

They're not affected by snap, but snap is affected by them.

> This is a very confusing property. Shouldn't there be a reference to device
> pixel ratio?

Maybe?  The relevant concepts are very ill-defined in the platform at
the moment (and this is a legacy property).

~TJ
Received on Monday, 29 July 2013 20:09:22 UTC

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