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Re: createBlobURL

From: Jonas Sicking <jonas@sicking.cc>
Date: Mon, 25 Oct 2010 19:48:20 -0700
Message-ID: <AANLkTin-xLpZsm0CEmjpv_OdQxKByOkGADjDc1fPE_4x@mail.gmail.com>
To: "Tab Atkins Jr." <jackalmage@gmail.com>
Cc: Anne van Kesteren <annevk@opera.com>, Arun Ranganathan <arun@mozilla.com>, public-webapps <public-webapps@w3.org>, Arthur Barstow <art.barstow@nokia.com>, Adam Barth <abarth@gmail.com>, Darin Fisher <darin@google.com>
On Mon, Oct 25, 2010 at 6:10 PM, Tab Atkins Jr. <jackalmage@gmail.com> wrote:
> On Mon, Oct 25, 2010 at 5:59 PM, Jonas Sicking <jonas@sicking.cc> wrote:
>> On Mon, Oct 25, 2010 at 5:56 PM, Tab Atkins Jr. <jackalmage@gmail.com> wrote:
>>> On Mon, Oct 25, 2010 at 5:51 PM, Jonas Sicking <jonas@sicking.cc> wrote:
>>>> On Mon, Oct 25, 2010 at 5:04 PM, Tab Atkins Jr. <jackalmage@gmail.com> wrote:
>>>>> On Mon, Oct 25, 2010 at 4:48 PM, Jonas Sicking <jonas@sicking.cc> wrote:
>>>>>> Like I said, I think creating an OM that covers all the cases here
>>>>>> would create something very complex. I'd love to see a useful proposal
>>>>>> for <http://dev.w3.org/csswg/css3-images/>.
>>>>>
>>>>> It doesn't seem overly difficult.  Using the proposed Values API,
>>>>> you'd do something like "elem.style.values.backgroundImage.url =
>>>>> [DOMURL goes here]".
>>>>
>>>> That doesn't cover nearly all the ways you can use URLs as defined in
>>>> http://dev.w3.org/csswg/css3-images/ which support multiple levels of
>>>> fallback images, with snapping and resolution as well as gradients and
>>>> fallback colors. And with used in a property like backgroundImage, you
>>>> can have several combined instances of those. Consider:
>>>>
>>>> style="background-image: image(sun.svg, 'sun.png' snap 150dpi),
>>>> image(wavy.svg, 'wavy.png' 150dpi, 'wavy.gif', radial-gradient(...))"
>>>
>>> This would be part of the <url> interface, and would be accepted
>>> anywhere a <url> is currently accepted.  Exposing the correct
>>> interface of function arguments would be a job for the function
>>> interface in the Values API, and is designed to be orthogonal.
>>
>> Note that the syntax for images is significantly different from the
>> syntax for urls. So I suspect you mean <image> rather than <url>
>> above.
>
> No, I meant <url>, which happens to be a type of <image> as well.  I
> don't know what it would mean for me to mean <image>, as that covers
> much more than what you can produce with a blob.
>
>
>> However it still leaves my original statement unanswered:
>>
>> "Like I said, I think creating an OM that covers all the cases here
>> would create something very complex. I'd love to see a useful proposal
>> for <http://dev.w3.org/csswg/css3-images/>"
>
> I outlined how it would work above, I thought.  Any property that can
> take a <url> should, in the Values API, be able to take a url object
> like we're describing here.  Any function that can take a <url> as an
> argument should do the same.  The exact interface for exposing
> function arguments hasn't been nailed down yet, but once you can do
> so, using it should be the same as using an ordinary property which
> just takes a <url>.

The question is, how do you use a DOMURL together with all the other
features of <image>. Using the createObjectURL proposal I can do:

elem.style.backgroundImage =
"image('" + createObjectURL(file1) + "' snap 150dpi)," +
"image('" + createObjectURL(file2) + "' 150dpi, radial-gradient(...))";

How would I do the equivalent if createObjectURL isn't available?

/ Jonas
Received on Tuesday, 26 October 2010 02:49:14 GMT

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