void GraphicsLayerUpdater::updateRecursive(RenderLayer& layer, UpdateType updateType, const UpdateContext& context, Vector<RenderLayer*>& layersNeedingPaintInvalidation)
{
if (layer.hasCompositedLayerMapping()) {
CompositedLayerMapping* mapping = layer.compositedLayerMapping();
if (updateType == ForceUpdate || mapping->needsGraphicsLayerUpdate()) {
const RenderLayer* compositingContainer = context.compositingContainer(layer);
ASSERT(compositingContainer == layer.enclosingLayerWithCompositedLayerMapping(ExcludeSelf));
if (mapping->updateGraphicsLayerConfiguration())
m_needsRebuildTree = true;
mapping->updateGraphicsLayerGeometry(compositingContainer, context.compositingStackingContext(), layersNeedingPaintInvalidation);
if (mapping->hasUnpositionedOverflowControlsLayers())
layer.scrollableArea()->positionOverflowControls(IntSize());
updateType = mapping->updateTypeForChildren(updateType);
mapping->clearNeedsGraphicsLayerUpdate();
}
}
UpdateContext childContext(context, layer);
for (RenderLayer* child = layer.firstChild(); child; child = child->nextSibling())
updateRecursive(*child, updateType, childContext, layersNeedingPaintInvalidation);
}
void CompositingRequirementsUpdater::update(PaintLayer* root)
{
TRACE_EVENT0("blink", "CompositingRequirementsUpdater::updateRecursive");
// Go through the layers in presentation order, so that we can compute which Layers need compositing layers.
// FIXME: we could maybe do this and the hierarchy update in one pass, but the parenting logic would be more complex.
RecursionData recursionData(root);
OverlapMap overlapTestRequestMap;
bool saw3DTransform = false;
// FIXME: Passing these unclippedDescendants down and keeping track
// of them dynamically, we are requiring a full tree walk. This
// should be removed as soon as proper overlap testing based on
// scrolling and animation bounds is implemented (crbug.com/252472).
Vector<PaintLayer*> unclippedDescendants;
IntRect absoluteDescendantBoundingBox;
updateRecursive(0, root, overlapTestRequestMap, recursionData, saw3DTransform, unclippedDescendants, absoluteDescendantBoundingBox);
}
void GraphicsLayerUpdater::update(RenderLayer& layer, Vector<RenderLayer*>& layersNeedingPaintInvalidation)
{
TRACE_EVENT0("blink", "GraphicsLayerUpdater::update");
updateRecursive(layer, DoNotForceUpdate, UpdateContext(), layersNeedingPaintInvalidation);
layer.compositor()->updateRootLayerPosition();
}
void CompositingRequirementsUpdater::updateRecursive(PaintLayer* ancestorLayer, PaintLayer* layer, OverlapMap& overlapMap, RecursionData& currentRecursionData,
bool& descendantHas3DTransform, Vector<PaintLayer*>& unclippedDescendants, IntRect& absoluteDescendantBoundingBox)
{
PaintLayerCompositor* compositor = m_layoutView.compositor();
layer->stackingNode()->updateLayerListsIfNeeded();
CompositingReasons reasonsToComposite = CompositingReasonNone;
CompositingReasons directReasons = m_compositingReasonFinder.directReasons(layer);
// Video is special. It's the only PaintLayer type that can both have
// PaintLayer children and whose children can't use its backing to render
// into. These children (the controls) always need to be promoted into their
// own layers to draw on top of the accelerated video.
if (currentRecursionData.m_compositingAncestor && currentRecursionData.m_compositingAncestor->layoutObject()->isVideo())
directReasons |= CompositingReasonVideoOverlay;
if (currentRecursionData.m_hasCompositedScrollingAncestor && layer->layoutObject()->styleRef().hasViewportConstrainedPosition())
directReasons |= CompositingReasonPositionFixed;
bool canBeComposited = compositor->canBeComposited(layer);
if (canBeComposited) {
reasonsToComposite |= directReasons;
if (layer->isRootLayer() && compositor->rootShouldAlwaysComposite())
reasonsToComposite |= CompositingReasonRoot;
if (reasonsToComposite && layer->scrollsOverflow() && !layer->needsCompositedScrolling()) {
// We will only set needsCompositedScrolling if we don't care about
// the LCD text hit, we may be able to switch to the compositor
// driven path if we're alread composited for other reasons and are
// therefore using grayscale AA.
//
// FIXME: it should also be possible to promote if the layer can
// still use LCD text when promoted, but detecting when the
// compositor can do this is tricky. Currently, the layer must be
// both opaque and may only have an integer translation as its
// transform. Both opacity and screen space transform are inherited
// properties, so this cannot be determined from local information.
layer->scrollableArea()->updateNeedsCompositedScrolling(PaintLayerScrollableArea::IgnoreLCDText);
if (layer->needsCompositedScrolling())
reasonsToComposite |= CompositingReasonOverflowScrollingTouch;
}
}
if ((reasonsToComposite & CompositingReasonOverflowScrollingTouch) && !layer->isRootLayer())
currentRecursionData.m_hasCompositedScrollingAncestor = true;
// Next, accumulate reasons related to overlap.
// If overlap testing is used, this reason will be overridden. If overlap testing is not
// used, we must assume we overlap if there is anything composited behind us in paint-order.
CompositingReasons overlapCompositingReason = currentRecursionData.m_subtreeIsCompositing ? CompositingReasonAssumedOverlap : CompositingReasonNone;
if (currentRecursionData.m_hasCompositedScrollingAncestor) {
Vector<size_t> unclippedDescendantsToRemove;
for (size_t i = 0; i < unclippedDescendants.size(); i++) {
PaintLayer* unclippedDescendant = unclippedDescendants.at(i);
// If we've reached the containing block of one of the unclipped
// descendants, that element is no longer relevant to whether or not we
// should opt in. Unfortunately we can't easily remove from the list
// while we're iterating, so we have to store it for later removal.
if (unclippedDescendant->layoutObject()->containingBlock() == layer->layoutObject()) {
unclippedDescendantsToRemove.append(i);
continue;
}
if (layer->scrollsWithRespectTo(unclippedDescendant))
reasonsToComposite |= CompositingReasonAssumedOverlap;
}
// Remove irrelevant unclipped descendants in reverse order so our stored
// indices remain valid.
for (size_t i = 0; i < unclippedDescendantsToRemove.size(); i++)
unclippedDescendants.remove(unclippedDescendantsToRemove.at(unclippedDescendantsToRemove.size() - i - 1));
if (reasonsToComposite & CompositingReasonOutOfFlowClipping)
unclippedDescendants.append(layer);
}
const IntRect& absBounds = layer->clippedAbsoluteBoundingBox();
absoluteDescendantBoundingBox = absBounds;
if (currentRecursionData.m_testingOverlap && !requiresCompositingOrSquashing(directReasons))
overlapCompositingReason = overlapMap.overlapsLayers(absBounds) ? CompositingReasonOverlap : CompositingReasonNone;
reasonsToComposite |= overlapCompositingReason;
// The children of this layer don't need to composite, unless there is
// a compositing layer among them, so start by inheriting the compositing
// ancestor with m_subtreeIsCompositing set to false.
RecursionData childRecursionData = currentRecursionData;
childRecursionData.m_subtreeIsCompositing = false;
bool willBeCompositedOrSquashed = canBeComposited && requiresCompositingOrSquashing(reasonsToComposite);
if (willBeCompositedOrSquashed) {
// This layer now acts as the ancestor for kids.
childRecursionData.m_compositingAncestor = layer;
// Here we know that all children and the layer's own contents can blindly paint into
// this layer's backing, until a descendant is composited. So, we don't need to check
// for overlap with anything behind this layer.
overlapMap.beginNewOverlapTestingContext();
// This layer is going to be composited, so children can safely ignore the fact that there's an
// animation running behind this layer, meaning they can rely on the overlap map testing again.
childRecursionData.m_testingOverlap = true;
}
#if ENABLE(ASSERT)
LayerListMutationDetector mutationChecker(layer->stackingNode());
#endif
bool anyDescendantHas3DTransform = false;
bool willHaveForegroundLayer = false;
if (layer->stackingNode()->isStackingContext()) {
PaintLayerStackingNodeIterator iterator(*layer->stackingNode(), NegativeZOrderChildren);
while (PaintLayerStackingNode* curNode = iterator.next()) {
IntRect absoluteChildDescendantBoundingBox;
updateRecursive(layer, curNode->layer(), overlapMap, childRecursionData, anyDescendantHas3DTransform, unclippedDescendants, absoluteChildDescendantBoundingBox);
absoluteDescendantBoundingBox.unite(absoluteChildDescendantBoundingBox);
// If we have to make a layer for this child, make one now so we can have a contents layer
// (since we need to ensure that the -ve z-order child renders underneath our contents).
if (childRecursionData.m_subtreeIsCompositing) {
reasonsToComposite |= CompositingReasonNegativeZIndexChildren;
if (!willBeCompositedOrSquashed) {
// make layer compositing
childRecursionData.m_compositingAncestor = layer;
overlapMap.beginNewOverlapTestingContext();
willBeCompositedOrSquashed = true;
willHaveForegroundLayer = true;
// FIXME: temporary solution for the first negative z-index composited child:
// re-compute the absBounds for the child so that we can add the
// negative z-index child's bounds to the new overlap context.
overlapMap.beginNewOverlapTestingContext();
overlapMap.add(curNode->layer(), curNode->layer()->clippedAbsoluteBoundingBox());
overlapMap.finishCurrentOverlapTestingContext();
}
}
}
}
if (willHaveForegroundLayer) {
ASSERT(willBeCompositedOrSquashed);
// A foreground layer effectively is a new backing for all subsequent children, so
// we don't need to test for overlap with anything behind this. So, we can finish
// the previous context that was accumulating rects for the negative z-index
// children, and start with a fresh new empty context.
overlapMap.finishCurrentOverlapTestingContext();
overlapMap.beginNewOverlapTestingContext();
// This layer is going to be composited, so children can safely ignore the fact that there's an
// animation running behind this layer, meaning they can rely on the overlap map testing again
childRecursionData.m_testingOverlap = true;
}
PaintLayerStackingNodeIterator iterator(*layer->stackingNode(), NormalFlowChildren | PositiveZOrderChildren);
while (PaintLayerStackingNode* curNode = iterator.next()) {
IntRect absoluteChildDescendantBoundingBox;
updateRecursive(layer, curNode->layer(), overlapMap, childRecursionData, anyDescendantHas3DTransform, unclippedDescendants, absoluteChildDescendantBoundingBox);
absoluteDescendantBoundingBox.unite(absoluteChildDescendantBoundingBox);
}
// Now that the subtree has been traversed, we can check for compositing reasons that depended on the state of the subtree.
if (layer->stackingNode()->isStackingContext()) {
layer->setShouldIsolateCompositedDescendants(childRecursionData.m_hasUnisolatedCompositedBlendingDescendant);
} else {
layer->setShouldIsolateCompositedDescendants(false);
currentRecursionData.m_hasUnisolatedCompositedBlendingDescendant = childRecursionData.m_hasUnisolatedCompositedBlendingDescendant;
}
// Subsequent layers in the parent's stacking context may also need to composite.
if (childRecursionData.m_subtreeIsCompositing)
currentRecursionData.m_subtreeIsCompositing = true;
// Set the flag to say that this SC has compositing children.
layer->setHasCompositingDescendant(childRecursionData.m_subtreeIsCompositing);
if (layer->isRootLayer()) {
// The root layer needs to be composited if anything else in the tree is composited.
// Otherwise, we can disable compositing entirely.
if (childRecursionData.m_subtreeIsCompositing || requiresCompositingOrSquashing(reasonsToComposite) || compositor->rootShouldAlwaysComposite()) {
reasonsToComposite |= CompositingReasonRoot;
currentRecursionData.m_subtreeIsCompositing = true;
} else {
compositor->setCompositingModeEnabled(false);
reasonsToComposite = CompositingReasonNone;
}
} else {
// All layers (even ones that aren't being composited) need to get added to
// the overlap map. Layers that are not separately composited will paint into their
// compositing ancestor's backing, and so are still considered for overlap.
if (childRecursionData.m_compositingAncestor && !childRecursionData.m_compositingAncestor->isRootLayer())
overlapMap.add(layer, absBounds);
// Now check for reasons to become composited that depend on the state of descendant layers.
CompositingReasons subtreeCompositingReasons = subtreeReasonsForCompositing(layer, childRecursionData.m_subtreeIsCompositing, anyDescendantHas3DTransform);
reasonsToComposite |= subtreeCompositingReasons;
if (!willBeCompositedOrSquashed && canBeComposited && requiresCompositingOrSquashing(subtreeCompositingReasons)) {
childRecursionData.m_compositingAncestor = layer;
// FIXME: this context push is effectively a no-op but needs to exist for
// now, because the code is designed to push overlap information to the
// second-from-top context of the stack.
overlapMap.beginNewOverlapTestingContext();
overlapMap.add(layer, absoluteDescendantBoundingBox);
willBeCompositedOrSquashed = true;
}
if (willBeCompositedOrSquashed)
reasonsToComposite |= layer->potentialCompositingReasonsFromStyle() & CompositingReasonInlineTransform;
// If the original layer is composited, the reflection needs to be, too.
if (layer->reflectionInfo()) {
// FIXME: Shouldn't we call computeCompositingRequirements to handle a reflection overlapping with another layoutObject?
PaintLayer* reflectionLayer = layer->reflectionInfo()->reflectionLayer();
CompositingReasons reflectionCompositingReason = willBeCompositedOrSquashed ? CompositingReasonReflectionOfCompositedParent : CompositingReasonNone;
reflectionLayer->setCompositingReasons(reflectionCompositingReason, CompositingReasonReflectionOfCompositedParent);
}
if (willBeCompositedOrSquashed && layer->layoutObject()->style()->hasBlendMode())
currentRecursionData.m_hasUnisolatedCompositedBlendingDescendant = true;
// Tell the parent it has compositing descendants.
if (willBeCompositedOrSquashed)
currentRecursionData.m_subtreeIsCompositing = true;
// Turn overlap testing off for later layers if it's already off, or if we have an animating transform.
// Note that if the layer clips its descendants, there's no reason to propagate the child animation to the parent layers. That's because
// we know for sure the animation is contained inside the clipping rectangle, which is already added to the overlap map.
bool isCompositedClippingLayer = canBeComposited && (reasonsToComposite & CompositingReasonClipsCompositingDescendants);
bool isCompositedWithInlineTransform = reasonsToComposite & CompositingReasonInlineTransform;
if ((!childRecursionData.m_testingOverlap && !isCompositedClippingLayer) || layer->layoutObject()->style()->hasCurrentTransformAnimation() || isCompositedWithInlineTransform)
currentRecursionData.m_testingOverlap = false;
if (childRecursionData.m_compositingAncestor == layer)
overlapMap.finishCurrentOverlapTestingContext();
descendantHas3DTransform |= anyDescendantHas3DTransform || layer->has3DTransform();
}
// At this point we have finished collecting all reasons to composite this layer.
layer->setCompositingReasons(reasonsToComposite);
}
void CompositingInputsUpdater::updateRecursive(DeprecatedPaintLayer* layer, UpdateType updateType, AncestorInfo info)
{
if (!layer->childNeedsCompositingInputsUpdate() && updateType != ForceUpdate)
return;
m_geometryMap.pushMappingsToAncestor(layer, layer->parent());
if (layer->hasCompositedDeprecatedPaintLayerMapping())
info.enclosingCompositedLayer = layer;
if (layer->needsCompositingInputsUpdate()) {
if (info.enclosingCompositedLayer)
info.enclosingCompositedLayer->compositedDeprecatedPaintLayerMapping()->setNeedsGraphicsLayerUpdate(GraphicsLayerUpdateSubtree);
updateType = ForceUpdate;
}
if (updateType == ForceUpdate) {
DeprecatedPaintLayer::AncestorDependentCompositingInputs properties;
if (!layer->isRootLayer()) {
properties.clippedAbsoluteBoundingBox = enclosingIntRect(m_geometryMap.absoluteRect(layer->boundingBoxForCompositingOverlapTest()));
// FIXME: Setting the absBounds to 1x1 instead of 0x0 makes very little sense,
// but removing this code will make JSGameBench sad.
// See https://codereview.chromium.org/13912020/
if (properties.clippedAbsoluteBoundingBox.isEmpty())
properties.clippedAbsoluteBoundingBox.setSize(IntSize(1, 1));
IntRect clipRect = pixelSnappedIntRect(layer->clipper().backgroundClipRect(ClipRectsContext(m_rootLayer, AbsoluteClipRects)).rect());
properties.clippedAbsoluteBoundingBox.intersect(clipRect);
const DeprecatedPaintLayer* parent = layer->parent();
properties.opacityAncestor = parent->isTransparent() ? parent : parent->opacityAncestor();
properties.transformAncestor = parent->hasTransformRelatedProperty() ? parent : parent->transformAncestor();
properties.filterAncestor = parent->hasFilter() ? parent : parent->filterAncestor();
bool layerIsFixedPosition = layer->layoutObject()->style()->position() == FixedPosition;
properties.nearestFixedPositionLayer = layerIsFixedPosition ? layer : parent->nearestFixedPositionLayer();
if (info.hasAncestorWithClipOrOverflowClip) {
const DeprecatedPaintLayer* parentLayerOnClippingContainerChain = findParentLayerOnClippingContainerChain(layer);
const bool parentHasClipOrOverflowClip = parentLayerOnClippingContainerChain->layoutObject()->hasClipOrOverflowClip();
properties.clippingContainer = parentHasClipOrOverflowClip ? parentLayerOnClippingContainerChain->layoutObject() : parentLayerOnClippingContainerChain->clippingContainer();
}
if (info.lastScrollingAncestor) {
const LayoutObject* containingBlock = layer->layoutObject()->containingBlock();
const DeprecatedPaintLayer* parentLayerOnContainingBlockChain = findParentLayerOnContainingBlockChain(containingBlock);
properties.ancestorScrollingLayer = parentLayerOnContainingBlockChain->ancestorScrollingLayer();
if (parentLayerOnContainingBlockChain->scrollsOverflow())
properties.ancestorScrollingLayer = parentLayerOnContainingBlockChain;
if (layer->layoutObject()->isOutOfFlowPositioned() && !layer->subtreeIsInvisible()) {
const DeprecatedPaintLayer* clippingLayer = properties.clippingContainer ? properties.clippingContainer->enclosingLayer() : layer->compositor()->rootLayer();
if (hasClippedStackingAncestor(layer, clippingLayer))
properties.clipParent = clippingLayer;
}
if (layer->stackingNode()->isTreatedAsStackingContextForPainting()
&& properties.ancestorScrollingLayer
&& !info.ancestorStackingContext->layoutObject()->isDescendantOf(properties.ancestorScrollingLayer->layoutObject()))
properties.scrollParent = properties.ancestorScrollingLayer;
}
}
properties.hasAncestorWithClipPath = info.hasAncestorWithClipPath;
layer->updateAncestorDependentCompositingInputs(properties);
}
if (layer->stackingNode()->isStackingContext())
info.ancestorStackingContext = layer;
if (layer->scrollsOverflow())
info.lastScrollingAncestor = layer;
if (layer->layoutObject()->hasClipOrOverflowClip())
info.hasAncestorWithClipOrOverflowClip = true;
if (layer->layoutObject()->hasClipPath())
info.hasAncestorWithClipPath = true;
DeprecatedPaintLayer::DescendantDependentCompositingInputs descendantProperties;
for (DeprecatedPaintLayer* child = layer->firstChild(); child; child = child->nextSibling()) {
updateRecursive(child, updateType, info);
descendantProperties.hasDescendantWithClipPath |= child->hasDescendantWithClipPath() || child->layoutObject()->hasClipPath();
descendantProperties.hasNonIsolatedDescendantWithBlendMode |= (!child->stackingNode()->isStackingContext() && child->hasNonIsolatedDescendantWithBlendMode()) || child->layoutObject()->style()->hasBlendMode();
}
layer->updateDescendantDependentCompositingInputs(descendantProperties);
layer->didUpdateCompositingInputs();
m_geometryMap.popMappingsToAncestor(layer->parent());
}
void CompositingInputsUpdater::update()
{
TRACE_EVENT0("blink", "CompositingInputsUpdater::update");
updateRecursive(m_rootLayer, DoNotForceUpdate, AncestorInfo());
}
