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Re: fill and stroke properties with CSS <image> values

From: Erik Dahlström <ed@opera.com>
Date: Thu, 23 Jan 2014 13:02:14 +0100
To: "Jeremie Patonnier" <jeremie.patonnier@gmail.com>
Cc: "Dirk Schulze" <dschulze@adobe.com>, "Tab Atkins Jr." <jackalmage@gmail.com>, www-svg <www-svg@w3.org>, public-fx <public-fx@w3.org>
Message-ID: <op.w942d0jadhsuf5@gnorps>
On Thu, 23 Jan 2014 11:45:03 +0100, Jeremie Patonnier  
<jeremie.patonnier@gmail.com> wrote:

> Hi!
> 2014/1/23 Erik Dahlström <ed@opera.com>
>> I'm wondering how much of a need there really is to have the fallback
>> color in the first place, maybe this is something we should revisit?
> Let's imagine the following use case:
>    1. You have an SVG image with a white background
>    2. I have a rect fill with a dark image (fill: url("stuff.png"))
>    3. I write some text on top of the rect which color is white
>    4. If for some reason the image is not loading, the text become not
>    visible (white text on a white background)
> Having a fallback color (let's say black) is a safety for such cases.

My next sentence was: "There might be a better alternative".

In other words, what if there was another way to address this use-case?  
Why would it necessarily have to use the current syntax?

> Another case is if you want to have an image that fade to a colored
> background. In such case, it's better to fill with an image as small as
> possible and fill the blank with the appropriate color instead of having  
> a
> large image mostly full of a plain color. This is more efficient in term  
> of
> network performance (we load a smaller resource) and rendering  
> performance
> (the color can be paint immediately, even if the image take some time to
> load).

I don't understand the point you're trying to make, why wouldn't this also  
be true for an alternative?

Multiple paints, e.g "fill: url(foo), url(bar)", is in the SVG2 spec  
already (currently just as an example, the <paint> grammar doesn't yet  
cover this), but the WG has resolved to have this feature[1]. I guess it  
still remains to be decided, but I would not expect rendering to stall  
just because all of the paints weren't fully loaded. Draw what there is,  
and update as needed.

I would imagine your example being e.g "fill: url(foo.png), green" or  
perhaps "fill: url(bar.png), image(yellow)".

[1] http://www.w3.org/2013/06/03-svg-minutes.html#item10

Erik Dahlstrom, Web Technology Developer, Opera Software
Co-Chair, W3C SVG Working Group
Received on Thursday, 23 January 2014 12:02:48 UTC

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