- From: Dirk Schulze <dschulze@adobe.com>
- Date: Thu, 23 Jan 2014 13:03:51 +0000
- To: Erik Dahlström <ed@opera.com>
- CC: Jeremie Patonnier <jeremie.patonnier@gmail.com>, Tab Atkins Jr. <jackalmage@gmail.com>, www-svg <www-svg@w3.org>, public-fx <public-fx@w3.org>
On Jan 23, 2014, at 1:02 PM, Erik Dahlström <ed@opera.com> wrote: > 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? Beside that… The HMTL world managed to deal with this situation without a fallback color for more than a decade now. HTML has much more likely content that would be affected than SVG. That said, Tab mentioned that there is a way to fill a layer with a color: image(<color>). Therefore, keeping the last color value as fallback might not be a big deal anyway. I personally have no strong opinion the one or the other way. Greetings, Dirk > >> 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 13:04:43 UTC