Bug 9752 – %-sizing of elements with a html parent is broken

• Component: SVG
• Status: RESOLVED FIXED

[Joost de Valk (AlthA)]

Following bug 9555, i encountered another bug: when an svg element has a size in percentages, and the parent is a html element, it doesn't draw at all. Adding simple testcase in a sec.

[Joost de Valk (AlthA)]

Created attachment 9224 [details]
testcase

[Eric Seidel (no email)]

Hum... shouldn't be hard to fix.

Looking at the RenderTree debug window, it seems the <svg> is correctly sized to 200x200, but the item inside it is not.  I expect this has to do with SVG doing all of its layout in the DOM tree instead of the render tree.

[Eric Seidel (no email)]

The function which would need to change is:
float SVGLength::PercentageOfViewport(float value, const SVGStyledElement* context, SVGLengthMode mode)


    } else if (viewportElement && viewportElement->isSVG()) {
        const SVGSVGElement* svg = static_cast<const SVGSVGElement*>(viewportElement);
        if (svg->hasAttribute(SVGNames::viewBoxAttr)) {
            width = svg->viewBox().width();
            height = svg->viewBox().height();
        } else {
            width = svg->width().value();
            height = svg->height().value();
        }
    }

Possibly that if should just check to see if the <svg> has a renderer() and if it does, use that width/height.  Seems a little hacky however.  Really SVG length resolution just needs to move entirely into the rendering tree.

[Eric Seidel (no email)]

This is probably at least related to bug 5940

[Rob Buis]

Created attachment 15025 [details]
First attempt

This should do it:)
Cheers,

Rob.

[Eric Seidel (no email)]

Comment on attachment 15025 [details]
First attempt

This looks fine.  Since the change is in SVGLength, I wonder if now things like <div><svg:circle></div> will draw...

[Rob Buis]

Landed in r 23530.