void SVGLayoutSupport::layoutChildren(LayoutObject* firstChild,
bool forceLayout,
bool screenScalingFactorChanged,
bool layoutSizeChanged) {
for (LayoutObject* child = firstChild; child; child = child->nextSibling()) {
bool forceChildLayout = forceLayout;
if (screenScalingFactorChanged) {
// If the screen scaling factor changed we need to update the text
// metrics (note: this also happens for layoutSizeChanged=true).
if (child->isSVGText())
toLayoutSVGText(child)->setNeedsTextMetricsUpdate();
forceChildLayout = true;
}
if (layoutSizeChanged) {
// When selfNeedsLayout is false and the layout size changed, we have to
// check whether this child uses relative lengths
if (SVGElement* element =
child->node()->isSVGElement() ? toSVGElement(child->node()) : 0) {
if (element->hasRelativeLengths()) {
// FIXME: this should be done on invalidation, not during layout.
// When the layout size changed and when using relative values tell
// the LayoutSVGShape to update its shape object
if (child->isSVGShape()) {
toLayoutSVGShape(child)->setNeedsShapeUpdate();
} else if (child->isSVGText()) {
toLayoutSVGText(child)->setNeedsTextMetricsUpdate();
toLayoutSVGText(child)->setNeedsPositioningValuesUpdate();
}
forceChildLayout = true;
}
}
}
// Resource containers are nasty: they can invalidate clients outside the
// current SubtreeLayoutScope.
// Since they only care about viewport size changes (to resolve their
// relative lengths), we trigger their invalidation directly from
// SVGSVGElement::svgAttributeChange() or at a higher SubtreeLayoutScope (in
// LayoutView::layout()). We do not create a SubtreeLayoutScope for
// resources because their ability to reference each other leads to circular
// layout. We protect against that within the layout code for resources, but
// it causes assertions if we use a SubTreeLayoutScope for them.
if (child->isSVGResourceContainer()) {
// Lay out any referenced resources before the child.
layoutResourcesIfNeeded(child);
child->layoutIfNeeded();
} else {
SubtreeLayoutScope layoutScope(*child);
if (forceChildLayout)
layoutScope.setNeedsLayout(child, LayoutInvalidationReason::SvgChanged);
// Lay out any referenced resources before the child.
layoutResourcesIfNeeded(child);
child->layoutIfNeeded();
}
}
}
void SVGLayoutSupport::layoutChildren(LayoutObject* start, bool selfNeedsLayout)
{
// When hasRelativeLengths() is false, no descendants have relative lengths
// (hence no one is interested in viewport size changes).
bool layoutSizeChanged = toSVGElement(start->node())->hasRelativeLengths()
&& layoutSizeOfNearestViewportChanged(start);
bool transformChanged = transformToRootChanged(start);
for (LayoutObject* child = start->slowFirstChild(); child; child = child->nextSibling()) {
bool forceLayout = selfNeedsLayout;
if (transformChanged) {
// If the transform changed we need to update the text metrics (note: this also happens for layoutSizeChanged=true).
if (child->isSVGText())
toLayoutSVGText(child)->setNeedsTextMetricsUpdate();
forceLayout = true;
}
if (layoutSizeChanged) {
// When selfNeedsLayout is false and the layout size changed, we have to check whether this child uses relative lengths
if (SVGElement* element = child->node()->isSVGElement() ? toSVGElement(child->node()) : 0) {
if (element->hasRelativeLengths()) {
// FIXME: this should be done on invalidation, not during layout.
// When the layout size changed and when using relative values tell the LayoutSVGShape to update its shape object
if (child->isSVGShape()) {
toLayoutSVGShape(child)->setNeedsShapeUpdate();
} else if (child->isSVGText()) {
toLayoutSVGText(child)->setNeedsTextMetricsUpdate();
toLayoutSVGText(child)->setNeedsPositioningValuesUpdate();
}
forceLayout = true;
}
}
}
SubtreeLayoutScope layoutScope(*child);
// Resource containers are nasty: they can invalidate clients outside the current SubtreeLayoutScope.
// Since they only care about viewport size changes (to resolve their relative lengths), we trigger
// their invalidation directly from SVGSVGElement::svgAttributeChange() or at a higher
// SubtreeLayoutScope (in LayoutView::layout()).
if (forceLayout && !child->isSVGResourceContainer())
layoutScope.setNeedsLayout(child, LayoutInvalidationReason::SvgChanged);
// Lay out any referenced resources before the child.
layoutResourcesIfNeeded(child);
child->layoutIfNeeded();
}
}
void SVGRenderSupport::layoutChildren(RenderObject* start, bool selfNeedsLayout)
{
bool layoutSizeChanged = layoutSizeOfNearestViewportChanged(start);
bool transformChanged = transformToRootChanged(start);
HashSet<RenderObject*> notlayoutedObjects;
for (RenderObject* child = start->slowFirstChild(); child; child = child->nextSibling()) {
bool needsLayout = selfNeedsLayout;
bool childEverHadLayout = child->everHadLayout();
if (transformChanged) {
// If the transform changed we need to update the text metrics (note: this also happens for layoutSizeChanged=true).
if (child->isSVGText())
toRenderSVGText(child)->setNeedsTextMetricsUpdate();
needsLayout = true;
}
if (layoutSizeChanged) {
// When selfNeedsLayout is false and the layout size changed, we have to check whether this child uses relative lengths
if (SVGElement* element = child->node()->isSVGElement() ? toSVGElement(child->node()) : 0) {
if (element->hasRelativeLengths()) {
// When the layout size changed and when using relative values tell the RenderSVGShape to update its shape object
if (child->isSVGShape()) {
toRenderSVGShape(child)->setNeedsShapeUpdate();
} else if (child->isSVGText()) {
toRenderSVGText(child)->setNeedsTextMetricsUpdate();
toRenderSVGText(child)->setNeedsPositioningValuesUpdate();
}
needsLayout = true;
}
}
}
SubtreeLayoutScope layoutScope(*child);
// Resource containers are nasty: they can invalidate clients outside the current SubtreeLayoutScope.
// Since they only care about viewport size changes (to resolve their relative lengths), we trigger
// their invalidation directly from SVGSVGElement::svgAttributeChange() or at a higher
// SubtreeLayoutScope (in RenderView::layout()).
if (needsLayout && !child->isSVGResourceContainer())
layoutScope.setNeedsLayout(child);
layoutResourcesIfNeeded(child);
if (child->needsLayout()) {
child->layout();
// Renderers are responsible for repainting themselves when changing, except
// for the initial paint to avoid potential double-painting caused by non-sensical "old" bounds.
// We could handle this in the individual objects, but for now it's easier to have
// parent containers call repaint(). (RenderBlock::layout* has similar logic.)
if (!childEverHadLayout && !RuntimeEnabledFeatures::repaintAfterLayoutEnabled())
child->paintInvalidationForWholeRenderer();
} else if (layoutSizeChanged) {
notlayoutedObjects.add(child);
}
}
if (!layoutSizeChanged) {
ASSERT(notlayoutedObjects.isEmpty());
return;
}
// If the layout size changed, invalidate all resources of all children that didn't go through the layout() code path.
HashSet<RenderObject*>::iterator end = notlayoutedObjects.end();
for (HashSet<RenderObject*>::iterator it = notlayoutedObjects.begin(); it != end; ++it)
invalidateResourcesOfChildren(*it);
}