void RenderMathMLRoot::layout()
{
RenderBlock::layout();
int maxHeight = toRenderBoxModelObject(lastChild())->offsetHeight();
RenderObject* current = lastChild()->firstChild();
current->style()->setVerticalAlign(BASELINE);
if (!maxHeight)
maxHeight = style()->fontSize();
// Base height above which the shape of the root changes
int thresholdHeight = static_cast<int>(gThresholdBaseHeight * style()->fontSize());
int topStartShift = 0;
if (maxHeight > thresholdHeight && thresholdHeight) {
float shift = (maxHeight - thresholdHeight) / static_cast<float>(thresholdHeight);
if (shift > 1.)
shift = 1.;
int frontWidth = static_cast<int>(style()->fontSize() * gRadicalWidth);
topStartShift = static_cast<int>(gRadicalBottomPointXPos * frontWidth * shift);
style()->setPaddingBottom(Length(static_cast<int>(gRootBottomPadding * style()->fontSize()), Fixed));
}
// Positioning of the index
RenderBoxModelObject* indexBox = toRenderBoxModelObject(firstChild()->firstChild());
int indexShift = indexBox->offsetWidth() + topStartShift;
int radicalHeight = static_cast<int>((1 - gRadicalTopLeftPointYPos) * maxHeight);
int rootMarginTop = radicalHeight + style()->paddingBottom().value() + indexBox->offsetHeight() - (maxHeight + static_cast<int>(gRootPadding * style()->fontSize()));
style()->setPaddingLeft(Length(indexShift, Fixed));
if (rootMarginTop > 0)
style()->setPaddingTop(Length(rootMarginTop + static_cast<int>(gRootPadding * style()->fontSize()), Fixed));
setNeedsLayoutAndPrefWidthsRecalc();
markContainingBlocksForLayout();
RenderBlock::layout();
indexBox->style()->setBottom(Length(radicalHeight + style()->paddingBottom().value(), Fixed));
// Now that we've potentially changed its position, we need layout the index again.
indexBox->setNeedsLayoutAndPrefWidthsRecalc();
indexBox->layout();
}
