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Bug 1162418 - Try to find a suitable non-zero dimension to use when containing block's inline-size depends on an SVG element which is specified as a percentage of its container. r=jwatt

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This commit is contained in:
Jonathan Kew 2015-08-31 16:22:20 +01:00
parent cafe2dfc67
commit 6bf6268612
1 changed files with 24 additions and 6 deletions
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30
layout/svg/nsSVGOuterSVGFrame.cpp
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@ -168,15 +168,33 @@ nsSVGOuterSVGFrame::GetPrefISize(nsRenderingContext *aRenderingContext)
DISPLAY_PREF_WIDTH(this, result);
SVGSVGElement *svg = static_cast<SVGSVGElement*>(mContent);
nsSVGLength2 &width = svg->mLengthAttributes[SVGSVGElement::ATTR_WIDTH];
WritingMode wm = GetWritingMode();
const nsSVGLength2& isize = wm.IsVertical()
? svg->mLengthAttributes[SVGSVGElement::ATTR_HEIGHT]
: svg->mLengthAttributes[SVGSVGElement::ATTR_WIDTH];
if (width.IsPercentage()) {
// It looks like our containing block's width may depend on our width. In
// that case our behavior is undefined according to CSS 2.1 section 10.3.2,
// so return zero.
if (isize.IsPercentage()) {
// It looks like our containing block's isize may depend on our isize. In
// that case our behavior is undefined according to CSS 2.1 section 10.3.2.
// As a last resort, we'll fall back to returning zero.
result = nscoord(0);
// Returning zero may be unhelpful, however, as it leads to unexpected
// disappearance of %-sized SVGs in orthogonal contexts, where our
// containing block wants to shrink-wrap. So let's look for an ancestor
// with non-zero size in this dimension, and use that as a (somewhat
// arbitrary) result instead.
nsIFrame *parent = GetParent();
while (parent) {
nscoord parentISize = parent->GetLogicalSize(wm).ISize(wm);
if (parentISize > 0 && parentISize != NS_UNCONSTRAINEDSIZE) {
result = parentISize;
break;
}
parent = parent->GetParent();
}
} else {
result = nsPresContext::CSSPixelsToAppUnits(width.GetAnimValue(svg));
result = nsPresContext::CSSPixelsToAppUnits(isize.GetAnimValue(svg));
if (result < 0) {
result = nscoord(0);
}