PaintLayerStackingNodeIterator::PaintLayerStackingNodeIterator(const PaintLayerStackingNode& root, unsigned whichChildren)
: m_root(root)
, m_remainingChildren(whichChildren)
, m_index(0)
{
m_currentNormalFlowChild = root.layer()->firstChild();
}
PaintLayerPainter::PaintResult PaintLayerPainter::paintChildren(unsigned childrenToVisit, GraphicsContext& context, const PaintLayerPaintingInfo& paintingInfo, PaintLayerFlags paintFlags)
{
PaintResult result = FullyPainted;
if (!m_paintLayer.hasSelfPaintingLayerDescendant())
return result;
#if ENABLE(ASSERT)
LayerListMutationDetector mutationChecker(m_paintLayer.stackingNode());
#endif
PaintLayerStackingNodeIterator iterator(*m_paintLayer.stackingNode(), childrenToVisit);
PaintLayerStackingNode* child = iterator.next();
if (!child)
return result;
IntSize scrollOffsetAccumulationForChildren = paintingInfo.scrollOffsetAccumulation;
if (m_paintLayer.layoutObject()->hasOverflowClip())
scrollOffsetAccumulationForChildren += m_paintLayer.layoutBox()->scrolledContentOffset();
for (; child; child = iterator.next()) {
PaintLayerPainter childPainter(*child->layer());
// If this Layer should paint into its own backing or a grouped backing, that will be done via CompositedLayerMapping::paintContents()
// and CompositedLayerMapping::doPaintTask().
if (!childPainter.shouldPaintLayerInSoftwareMode(paintingInfo.globalPaintFlags(), paintFlags))
continue;
PaintLayerPaintingInfo childPaintingInfo = paintingInfo;
childPaintingInfo.scrollOffsetAccumulation = scrollOffsetAccumulationForChildren;
// Rare case: accumulate scroll offset of non-stacking-context ancestors up to m_paintLayer.
for (PaintLayer* parentLayer = child->layer()->parent(); parentLayer != &m_paintLayer; parentLayer = parentLayer->parent()) {
if (parentLayer->layoutObject()->hasOverflowClip())
childPaintingInfo.scrollOffsetAccumulation += parentLayer->layoutBox()->scrolledContentOffset();
}
if (childPainter.paintLayer(context, childPaintingInfo, paintFlags) == MayBeClippedByPaintDirtyRect)
result = MayBeClippedByPaintDirtyRect;
}
return result;
}
PaintLayerPainter::PaintResult PaintLayerPainter::paintChildren(unsigned childrenToVisit, GraphicsContext* context, const PaintLayerPaintingInfo& paintingInfo, PaintLayerFlags paintFlags)
{
PaintResult result = FullyPainted;
if (!m_paintLayer.hasSelfPaintingLayerDescendant())
return result;
#if ENABLE(ASSERT)
LayerListMutationDetector mutationChecker(m_paintLayer.stackingNode());
#endif
PaintLayerStackingNodeIterator iterator(*m_paintLayer.stackingNode(), childrenToVisit);
PaintLayerStackingNode* child = iterator.next();
if (!child)
return result;
DisplayItem::Type subsequenceType;
if (childrenToVisit == NegativeZOrderChildren) {
subsequenceType = DisplayItem::SubsequenceNegativeZOrder;
} else {
ASSERT(childrenToVisit == (NormalFlowChildren | PositiveZOrderChildren));
subsequenceType = DisplayItem::SubsequenceNormalFlowAndPositiveZOrder;
}
Optional<SubsequenceRecorder> subsequenceRecorder;
if (!paintingInfo.disableSubsequenceCache
&& !(paintingInfo.globalPaintFlags() & GlobalPaintFlattenCompositingLayers)
&& !(paintFlags & PaintLayerPaintingReflection)
&& !(paintFlags & PaintLayerPaintingRootBackgroundOnly)) {
if (!m_paintLayer.needsRepaint()
&& paintingInfo.scrollOffsetAccumulation == m_paintLayer.previousScrollOffsetAccumulationForPainting()
&& SubsequenceRecorder::useCachedSubsequenceIfPossible(*context, m_paintLayer, subsequenceType))
return result;
subsequenceRecorder.emplace(*context, m_paintLayer, subsequenceType);
}
IntSize scrollOffsetAccumulationForChildren = paintingInfo.scrollOffsetAccumulation;
if (m_paintLayer.layoutObject()->hasOverflowClip())
scrollOffsetAccumulationForChildren += m_paintLayer.layoutBox()->scrolledContentOffset();
bool disableChildSubsequenceCache = !RuntimeEnabledFeatures::slimmingPaintV2Enabled()
&& (m_paintLayer.layoutObject()->hasOverflowClip() || m_paintLayer.layoutObject()->hasClip());
for (; child; child = iterator.next()) {
PaintLayerPainter childPainter(*child->layer());
// If this Layer should paint into its own backing or a grouped backing, that will be done via CompositedLayerMapping::paintContents()
// and CompositedLayerMapping::doPaintTask().
if (!childPainter.shouldPaintLayerInSoftwareMode(paintingInfo.globalPaintFlags(), paintFlags))
continue;
PaintLayerPaintingInfo childPaintingInfo = paintingInfo;
childPaintingInfo.disableSubsequenceCache = disableChildSubsequenceCache;
childPaintingInfo.scrollOffsetAccumulation = scrollOffsetAccumulationForChildren;
// Rare case: accumulate scroll offset of non-stacking-context ancestors up to m_paintLayer.
for (PaintLayer* parentLayer = child->layer()->parent(); parentLayer != &m_paintLayer; parentLayer = parentLayer->parent()) {
if (parentLayer->layoutObject()->hasOverflowClip())
childPaintingInfo.scrollOffsetAccumulation += parentLayer->layoutBox()->scrolledContentOffset();
}
if (childPainter.paintLayer(context, childPaintingInfo, paintFlags) == MaybeNotFullyPainted)
result = MaybeNotFullyPainted;
}
// Set subsequence not cacheable if the bounding box of this layer and descendants is not fully contained
// by paintRect, because later paintRect changes may expose new contents which will need repainting.
if (result == MaybeNotFullyPainted && subsequenceRecorder)
subsequenceRecorder->setUncacheable();
return result;
}