Re: Suggestion: 'bbox-rendering' property

Paul:

Cameron should be following up [1], but the main gist was that `fill` and
`stroke` should become shorthand properties, and each one should have a
sub-property in which you were able to specify the reference bounding box
to use for each fill/stroke paint server.

Key points of the debate:

- Everyone liked the idea of having control over which bounding box to use
for paint servers.

- However, that control would have to be linked to specific uses of that
paint server (e.g., as stroke paint vs as fill paint), so a single
over-riding property doesn't seem appropriate.

- Everyone agreed that we should try to maintain a consistent syntax with
other properties that relate to object bounding boxes.

- Currently, the masking spec [2] uses a separate property (mask-origin) to
declare the reference box (with the option of declaring it in the mask
shorthand property) while clipping paths only have a single, multi-part
property.  So the "consistency" goal doesn't really lean one way or another.

- Although no one brought it up on the call, the current SVG 2 syntax for
stroke and fill [3] also allows you to specify a size for each paint
server, but it is not currently described in terms of reference boxes.

- Because SVG2 fill and stroke can both be a list of paint servers, authors
should have the choice of specifying a single reference box for all of them
or separate reference boxes for each.  The general CSS rules for "list"
values and shorthand properties support this if there is a separate
property.

If you're interested in coming up with more use cases, suggestions and/or a
full proposal, please do so.

AmeliaBR

[1]: ACTION-3772 http://www.w3.org/Graphics/SVG/WG/track/actions/3772
[2]: http://dev.w3.org/fxtf/css-masking-1/
[3]: https://svgwg.org/svg2-draft/painting.html#SpecifyingPaint



On 20 March 2015 at 11:36, Paul LeBeau <paul.lebeau@gmail.com> wrote:

> In the 11/12 March telecon there was an ACTION item to follow up on this
> suggestion.  I haven't seen anything, so thought I'd do a reminder bump. :)
>
> I'm not sure I completely followed the gist of where the telecon
> discussion was leading.  Can someone explain please?
>
> Paul
>
>
> On 8 March 2015 at 20:41, Paul LeBeau <paul.lebeau@gmail.com> wrote:
>
>> The gettBBox() function now allows you to control which parts of the
>> shape are included in the bounding box.  So I suggest that we expose that
>> functionality as a property.
>>
>> bbox-rendering = "[fill] [stroke] [markers]"
>>
>> The purpose being is that it would affect the bbox used for
>> "objectBoundingBox" units.  The name is a placeholder in lieu of something
>> better.
>>
>> There was a discussion related to this concept in Feb 2014 wrt HTML
>> clipping and masking, but AFAIK this hasn't been suggested in the SVG
>> context. (maybe I am wrong?)
>>
>>
>> So I submit the following for consideration:
>>
>> http://www.paullebeau.com/svg2/bbox-rendering/bbox-rendering.html
>>
>>
>> Paul
>>
>>
>