LayoutRect unionRectEvenIfEmpty(const Vector<LayoutRect>& rects) {
size_t count = rects.size();
if (!count)
return LayoutRect();
LayoutRect result = rects[0];
for (size_t i = 1; i < count; ++i)
result.uniteEvenIfEmpty(rects[i]);
return result;
}
LayoutRect MultiColumnFragmentainerGroup::calculateOverflow() const {
// Note that we just return the bounding rectangle of the column boxes here.
// We currently don't examine overflow caused by the actual content that ends
// up in each column.
LayoutRect overflowRect;
if (unsigned columnCount = actualColumnCount()) {
overflowRect = columnRectAt(0);
if (columnCount > 1)
overflowRect.uniteEvenIfEmpty(columnRectAt(columnCount - 1));
}
return overflowRect;
}