LayoutUnit RenderSVGRoot::computeReplacedLogicalHeight() const
{
SVGSVGElement* svg = static_cast<SVGSVGElement*>(node());
ASSERT(svg);
// When we're embedded through SVGImage (border-image/background-image/<html:img>/...) we're forced to resize to a specific size.
if (!m_containerSize.isEmpty())
return m_containerSize.height();
if (hasReplacedLogicalHeight())
return RenderReplaced::computeReplacedLogicalHeight();
if (svg->heightAttributeEstablishesViewport()) {
Length height = svg->intrinsicHeight(SVGSVGElement::IgnoreCSSProperties);
if (height.isPercent()) {
RenderBlock* cb = containingBlock();
ASSERT(cb);
while (cb->isAnonymous()) {
cb = cb->containingBlock();
cb->addPercentHeightDescendant(const_cast<RenderSVGRoot*>(this));
}
} else
RenderBlock::removePercentHeightDescendant(const_cast<RenderSVGRoot*>(this));
return resolveLengthAttributeForSVG(height, style()->effectiveZoom(), containingBlock()->availableLogicalHeight());
}
// Only SVGs embedded in <object> reach this point.
ASSERT(isEmbeddedThroughFrameContainingSVGDocument());
return document()->frame()->ownerRenderer()->availableLogicalHeight();
}
LayoutUnit RenderSVGRoot::computeReplacedLogicalHeight() const
{
// When we're embedded through SVGImage (border-image/background-image/<html:img>/...) we're forced to resize to a specific size.
if (!m_containerSize.isEmpty())
return m_containerSize.height();
if (style()->logicalHeight().isSpecified() || style()->logicalMaxHeight().isSpecified())
return RenderReplaced::computeReplacedLogicalHeight();
if (svgSVGElement().heightAttributeEstablishesViewport()) {
Length height = svgSVGElement().intrinsicHeight(SVGSVGElement::IgnoreCSSProperties);
if (height.isPercent()) {
RenderBlock* cb = containingBlock();
ASSERT(cb);
while (cb->isAnonymous() && !cb->isRenderView()) {
cb = cb->containingBlock();
cb->addPercentHeightDescendant(const_cast<RenderSVGRoot&>(*this));
}
} else
RenderBlock::removePercentHeightDescendant(const_cast<RenderSVGRoot&>(*this));
return resolveLengthAttributeForSVG(height, style()->effectiveZoom(), containingBlock()->availableLogicalHeight(IncludeMarginBorderPadding), &view());
}
// SVG embedded through object/embed/iframe.
if (isEmbeddedThroughFrameContainingSVGDocument())
return frame().ownerRenderer()->availableLogicalHeight(IncludeMarginBorderPadding);
// SVG embedded via SVGImage (background-image/border-image/etc) / Inline SVG.
return RenderReplaced::computeReplacedLogicalHeight();
}
bool RenderBoxModelObject::hasAutoHeightOrContainingBlockWithAutoHeight() const
{
Length logicalHeightLength = style()->logicalHeight();
if (logicalHeightLength.isAuto())
return true;
// For percentage heights: The percentage is calculated with respect to the height of the generated box's
// containing block. If the height of the containing block is not specified explicitly (i.e., it depends
// on content height), and this element is not absolutely positioned, the value computes to 'auto'.
if (!logicalHeightLength.isPercent() || isOutOfFlowPositioned() || document().inQuirksMode())
return false;
// Anonymous block boxes are ignored when resolving percentage values that would refer to it:
// the closest non-anonymous ancestor box is used instead.
RenderBlock* cb = containingBlock();
while (cb->isAnonymous())
cb = cb->containingBlock();
// Matching RenderBox::percentageLogicalHeightIsResolvableFromBlock() by
// ignoring table cell's attribute value, where it says that table cells violate
// what the CSS spec says to do with heights. Basically we
// don't care if the cell specified a height or not.
if (cb->isTableCell())
return false;
// Match RenderBox::availableLogicalHeightUsing by special casing
// the render view. The available height is taken from the frame.
if (cb->isRenderView())
return false;
if (cb->isOutOfFlowPositioned() && !cb->style()->logicalTop().isAuto() && !cb->style()->logicalBottom().isAuto())
return false;
// If the height of the containing block computes to 'auto', then it hasn't been 'specified explicitly'.
return cb->hasAutoHeightOrContainingBlockWithAutoHeight();
}
