void SVGRenderSupport::layoutChildren(RenderObject* start, bool selfNeedsLayout)
{
bool layoutSizeChanged = layoutSizeOfNearestViewportChanged(start);
bool transformChanged = transformToRootChanged(start);
bool hasSVGShadow = rendererHasSVGShadow(start);
bool needsBoundariesUpdate = start->needsBoundariesUpdate();
HashSet<RenderObject*> notlayoutedObjects;
for (RenderObject* child = start->firstChildSlow(); child; child = child->nextSibling()) {
bool needsLayout = selfNeedsLayout;
bool childEverHadLayout = child->everHadLayout();
if (needsBoundariesUpdate && hasSVGShadow) {
// If we have a shadow, our shadow is baked into our children's cached boundaries,
// so they need to update.
child->setNeedsBoundariesUpdate();
needsLayout = true;
}
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;
}
}
}
if (needsLayout)
child->setNeedsLayout(MarkOnlyThis);
if (child->needsLayout()) {
toRenderElement(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)
child->repaint();
} else if (layoutSizeChanged)
notlayoutedObjects.add(child);
ASSERT(!child->needsLayout());
}
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);
}
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);
}
void SVGRenderSupport::layoutChildren(RenderElement& start, bool selfNeedsLayout)
{
bool layoutSizeChanged = layoutSizeOfNearestViewportChanged(start);
bool transformChanged = transformToRootChanged(&start);
bool hasSVGShadow = rendererHasSVGShadow(start);
bool needsBoundariesUpdate = start.needsBoundariesUpdate();
HashSet<RenderElement*> elementsThatDidNotReceiveLayout;
for (RenderObject* child = start.firstChild(); child; child = child->nextSibling()) {
bool needsLayout = selfNeedsLayout;
bool childEverHadLayout = child->everHadLayout();
if (needsBoundariesUpdate && hasSVGShadow) {
// If we have a shadow, our shadow is baked into our children's cached boundaries,
// so they need to update.
child->setNeedsBoundariesUpdate();
needsLayout = true;
}
if (transformChanged) {
// If the transform changed we need to update the text metrics (note: this also happens for layoutSizeChanged=true).
if (is<RenderSVGText>(*child))
downcast<RenderSVGText>(*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 = is<SVGElement>(*child->node()) ? downcast<SVGElement>(child->node()) : nullptr) {
if (element->hasRelativeLengths()) {
// When the layout size changed and when using relative values tell the RenderSVGShape to update its shape object
if (is<RenderSVGShape>(*child))
downcast<RenderSVGShape>(*child).setNeedsShapeUpdate();
else if (is<RenderSVGText>(*child)) {
RenderSVGText& svgText = downcast<RenderSVGText>(*child);
svgText.setNeedsTextMetricsUpdate();
svgText.setNeedsPositioningValuesUpdate();
}
needsLayout = true;
}
}
}
if (needsLayout)
child->setNeedsLayout(MarkOnlyThis);
if (child->needsLayout()) {
downcast<RenderElement>(*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)
child->repaint();
} else if (layoutSizeChanged && is<RenderElement>(*child))
elementsThatDidNotReceiveLayout.add(downcast<RenderElement>(child));
ASSERT(!child->needsLayout());
}
if (!layoutSizeChanged) {
ASSERT(elementsThatDidNotReceiveLayout.isEmpty());
return;
}
// If the layout size changed, invalidate all resources of all children that didn't go through the layout() code path.
for (auto* element : elementsThatDidNotReceiveLayout)
invalidateResourcesOfChildren(*element);
}