bool PaintLayerCompositor::attachFrameContentLayersToIframeLayer(LayoutPart* layoutObject)
{
PaintLayerCompositor* innerCompositor = frameContentsCompositor(layoutObject);
if (!innerCompositor || !innerCompositor->staleInCompositingMode() || innerCompositor->rootLayerAttachment() != RootLayerAttachedViaEnclosingFrame)
return false;
PaintLayer* layer = layoutObject->layer();
if (!layer->hasCompositedLayerMapping())
return false;
layer->compositedLayerMapping()->setSublayers(GraphicsLayerVector(1, innerCompositor->rootGraphicsLayer()));
return true;
}
bool PaintLayerCompositor::allocateOrClearCompositedLayerMapping(PaintLayer* layer, const CompositingStateTransitionType compositedLayerUpdate)
{
bool compositedLayerMappingChanged = false;
// FIXME: It would be nice to directly use the layer's compositing reason,
// but allocateOrClearCompositedLayerMapping also gets called without having updated compositing
// requirements fully.
switch (compositedLayerUpdate) {
case AllocateOwnCompositedLayerMapping:
ASSERT(!layer->hasCompositedLayerMapping());
setCompositingModeEnabled(true);
// If we need to issue paint invalidations, do so before allocating the compositedLayerMapping and clearing out the groupedMapping.
paintInvalidationOnCompositingChange(layer);
// If this layer was previously squashed, we need to remove its reference to a groupedMapping right away, so
// that computing paint invalidation rects will know the layer's correct compositingState.
// FIXME: do we need to also remove the layer from it's location in the squashing list of its groupedMapping?
// Need to create a test where a squashed layer pops into compositing. And also to cover all other
// sorts of compositingState transitions.
layer->setLostGroupedMapping(false);
layer->setGroupedMapping(nullptr, PaintLayer::InvalidateLayerAndRemoveFromMapping);
layer->ensureCompositedLayerMapping();
compositedLayerMappingChanged = true;
// At this time, the ScrollingCooridnator only supports the top-level frame.
if (layer->isRootLayer() && m_layoutView.frame()->isLocalRoot()) {
if (ScrollingCoordinator* scrollingCoordinator = this->scrollingCoordinator())
scrollingCoordinator->frameViewRootLayerDidChange(m_layoutView.frameView());
}
break;
case RemoveOwnCompositedLayerMapping:
// PutInSquashingLayer means you might have to remove the composited layer mapping first.
case PutInSquashingLayer:
if (layer->hasCompositedLayerMapping()) {
// If we're removing the compositedLayerMapping from a reflection, clear the source GraphicsLayer's pointer to
// its replica GraphicsLayer. In practice this should never happen because reflectee and reflection
// are both either composited, or not composited.
if (layer->isReflection()) {
PaintLayer* sourceLayer = toLayoutBoxModelObject(layer->layoutObject()->parent())->layer();
if (sourceLayer->hasCompositedLayerMapping()) {
ASSERT(sourceLayer->compositedLayerMapping()->mainGraphicsLayer()->replicaLayer() == layer->compositedLayerMapping()->mainGraphicsLayer());
sourceLayer->compositedLayerMapping()->mainGraphicsLayer()->setReplicatedByLayer(nullptr);
}
}
layer->clearCompositedLayerMapping();
compositedLayerMappingChanged = true;
}
break;
case RemoveFromSquashingLayer:
case NoCompositingStateChange:
// Do nothing.
break;
}
if (compositedLayerMappingChanged && layer->layoutObject()->isLayoutPart()) {
PaintLayerCompositor* innerCompositor = frameContentsCompositor(toLayoutPart(layer->layoutObject()));
if (innerCompositor && innerCompositor->staleInCompositingMode())
innerCompositor->updateRootLayerAttachment();
}
if (compositedLayerMappingChanged)
layer->clipper().clearClipRectsIncludingDescendants(PaintingClipRects);
// If a fixed position layer gained/lost a compositedLayerMapping or the reason not compositing it changed,
// the scrolling coordinator needs to recalculate whether it can do fast scrolling.
if (compositedLayerMappingChanged) {
if (ScrollingCoordinator* scrollingCoordinator = this->scrollingCoordinator())
scrollingCoordinator->frameViewFixedObjectsDidChange(m_layoutView.frameView());
}
return compositedLayerMappingChanged;
}
