Hi Cameron,
Cameron McCormack wrote:
The way I would implement background-fill
would be in the various renderers. The JSVGCanvas
already has a method to set the background color
(Through swing's setBackground() method). The
transcoders have 'KEY_BACKGROUND_COLOR' which
could use the background from the outermost
SVG element. So I would modify these to look for
the property or get the 'backgroundColor' value from
the RootGraphicsNode and use it when another default
has not been given.
I think that's ok for the root svg element, but since every
viewport-opening element can have a background-fill it needs to be drawn
during rendering. For example:
Hmm, I'm looking at the latest mobile draft and they don't
seem to have a 'background-fill' they have a 'viewport-fill':
http://www.w3.org/TR/SVGMobile12/painting.html#viewport-fill-property
This would (I think) only fill the x/y/width/height of the element.
<svg version="1.2" width="400" height="400">
<svg x="100" y="100" width="200" height="200"
background-fill="blue"/>
<svg x="10" y="10" width="10" height="10"
background-fill="red" background-fill-opacity="0.5"
overflow="visible"/>
</svg>
The svg element with the translucent red background should cover the
whole canvas, blending with the smaller blue backgrounded svg.
Bah, that would be really annoying, I hope that isn't the case...
Otherwise, you are correct that there is no real
way to have this work given the infinite canvas
(you can do some things like check the clip on
the Graphics2D and fill that region, but AFAIK
there is no requirement that there be a clip, so
what do you fill in that case? ;)
Well, just the area visible in JSVGCanvas or transcoded image I guess.
I am not very familiar with how the renderer works. Would updating the
CanvasGraphicsNode to have a new primitive bounds whenever the document
is panned (as in option 3) be reasonable? Does it matter that
getPrimitiveBounds would return an area smaller than the conceptual area
that would be filled (returning the visible canvas size (clipped)
instead of infinite)? Does off screen compositing have any extra
considerations?
Thanks,
Cameron
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