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// Copyright 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "cc/trees/tree_synchronizer.h"
#include <stddef.h>
#include <set>
#include "base/logging.h"
#include "base/trace_event/trace_event.h"
#include "cc/layers/layer.h"
#include "cc/layers/layer_collections.h"
#include "cc/layers/layer_impl.h"
#include "cc/trees/layer_tree_host.h"
#include "cc/trees/layer_tree_impl.h"
namespace cc {
template <typename LayerType>
void SynchronizeTreesInternal(LayerType* layer_root, LayerTreeImpl* tree_impl) {
DCHECK(tree_impl);
TRACE_EVENT0("cc", "TreeSynchronizer::SynchronizeTrees");
scoped_ptr<OwnedLayerImplList> old_layers(tree_impl->DetachLayers());
OwnedLayerImplMap old_layer_map;
for (auto& it : *old_layers)
old_layer_map[it->id()] = std::move(it);
SynchronizeTreesRecursive(&old_layer_map, layer_root, tree_impl);
for (auto& it : old_layer_map) {
if (it.second) {
// Need to ensure that layer destruction doesn't tear down child
// LayerImpl that have been used in the new tree.
it.second->children().clear();
}
}
}
void TreeSynchronizer::SynchronizeTrees(Layer* layer_root,
LayerTreeImpl* tree_impl) {
if (!layer_root)
tree_impl->ClearLayers();
else
SynchronizeTreesInternal(layer_root, tree_impl);
}
void TreeSynchronizer::SynchronizeTrees(LayerImpl* layer_root,
LayerTreeImpl* tree_impl) {
if (!layer_root)
tree_impl->ClearLayers();
else
SynchronizeTreesInternal(layer_root, tree_impl);
}
template <typename LayerType>
scoped_ptr<LayerImpl> ReuseOrCreateLayerImpl(OwnedLayerImplMap* old_layers,
LayerType* layer,
LayerTreeImpl* tree_impl) {
if (!layer)
return nullptr;
scoped_ptr<LayerImpl> layer_impl = std::move((*old_layers)[layer->id()]);
if (!layer_impl)
layer_impl = layer->CreateLayerImpl(tree_impl);
return layer_impl;
}
template <typename LayerType>
scoped_ptr<LayerImpl> SynchronizeTreesRecursiveInternal(
OwnedLayerImplMap* old_layers,
LayerType* layer,
LayerTreeImpl* tree_impl) {
if (!layer)
return nullptr;
scoped_ptr<LayerImpl> layer_impl(
ReuseOrCreateLayerImpl(old_layers, layer, tree_impl));
layer_impl->children().clear();
for (size_t i = 0; i < layer->children().size(); ++i) {
layer_impl->AddChild(SynchronizeTreesRecursiveInternal(
old_layers, layer->child_at(i), tree_impl));
}
scoped_ptr<LayerImpl> mask_layer = SynchronizeTreesRecursiveInternal(
old_layers, layer->mask_layer(), tree_impl);
if (layer_impl->mask_layer() && mask_layer &&
layer_impl->mask_layer() == mask_layer.get()) {
// In this case, we only need to update the ownership, as we're essentially
// just resetting the mask layer.
tree_impl->AddLayer(std::move(mask_layer));
} else {
layer_impl->SetMaskLayer(std::move(mask_layer));
}
scoped_ptr<LayerImpl> replica_layer = SynchronizeTreesRecursiveInternal(
old_layers, layer->replica_layer(), tree_impl);
if (layer_impl->replica_layer() && replica_layer &&
layer_impl->replica_layer() == replica_layer.get()) {
// In this case, we only need to update the ownership, as we're essentially
// just resetting the replica layer.
tree_impl->AddLayer(std::move(replica_layer));
} else {
layer_impl->SetReplicaLayer(std::move(replica_layer));
}
return layer_impl;
}
void SynchronizeTreesRecursive(OwnedLayerImplMap* old_layers,
Layer* old_root,
LayerTreeImpl* tree_impl) {
tree_impl->SetRootLayer(
SynchronizeTreesRecursiveInternal(old_layers, old_root, tree_impl));
}
void SynchronizeTreesRecursive(OwnedLayerImplMap* old_layers,
LayerImpl* old_root,
LayerTreeImpl* tree_impl) {
tree_impl->SetRootLayer(
SynchronizeTreesRecursiveInternal(old_layers, old_root, tree_impl));
}
static void CheckScrollAndClipPointersRecursive(Layer* layer,
LayerImpl* layer_impl) {
DCHECK_EQ(!!layer, !!layer_impl);
if (!layer)
return;
// Having a scroll parent on the impl thread implies having one the main
// thread, too. The main thread may have a scroll parent that is not in the
// tree because it's been removed but not deleted. In this case, the layer
// impl will have no scroll parent. Same argument applies for clip parents and
// scroll/clip children.
DCHECK(!layer_impl->scroll_parent() || !!layer->scroll_parent());
DCHECK(!layer_impl->clip_parent() || !!layer->clip_parent());
DCHECK(!layer_impl->scroll_children() || !!layer->scroll_children());
DCHECK(!layer_impl->clip_children() || !!layer->clip_children());
if (layer_impl->scroll_parent())
DCHECK_EQ(layer->scroll_parent()->id(), layer_impl->scroll_parent()->id());
if (layer_impl->clip_parent())
DCHECK_EQ(layer->clip_parent()->id(), layer_impl->clip_parent()->id());
if (layer_impl->scroll_children()) {
for (std::set<Layer*>::iterator it = layer->scroll_children()->begin();
it != layer->scroll_children()->end(); ++it) {
DCHECK_EQ((*it)->scroll_parent(), layer);
}
for (std::set<LayerImpl*>::iterator it =
layer_impl->scroll_children()->begin();
it != layer_impl->scroll_children()->end(); ++it) {
DCHECK_EQ((*it)->scroll_parent(), layer_impl);
}
}
if (layer_impl->clip_children()) {
for (std::set<Layer*>::iterator it = layer->clip_children()->begin();
it != layer->clip_children()->end(); ++it) {
DCHECK_EQ((*it)->clip_parent(), layer);
}
for (std::set<LayerImpl*>::iterator it =
layer_impl->clip_children()->begin();
it != layer_impl->clip_children()->end(); ++it) {
DCHECK_EQ((*it)->clip_parent(), layer_impl);
}
}
for (size_t i = 0u; i < layer->children().size(); ++i) {
CheckScrollAndClipPointersRecursive(layer->child_at(i),
layer_impl->child_at(i));
}
}
template <typename LayerType>
static void PushLayerPropertiesInternal(
std::unordered_set<LayerType*> layers_that_should_push_properties,
LayerTreeImpl* impl_tree) {
for (auto layer : layers_that_should_push_properties) {
LayerImpl* layer_impl = impl_tree->LayerById(layer->id());
DCHECK(layer_impl);
layer->PushPropertiesTo(layer_impl);
}
}
void TreeSynchronizer::PushLayerProperties(LayerTreeImpl* pending_tree,
LayerTreeImpl* active_tree) {
PushLayerPropertiesInternal(pending_tree->LayersThatShouldPushProperties(),
active_tree);
}
void TreeSynchronizer::PushLayerProperties(LayerTreeHost* host_tree,
LayerTreeImpl* impl_tree) {
PushLayerPropertiesInternal(host_tree->LayersThatShouldPushProperties(),
impl_tree);
#if DCHECK_IS_ON()
if (host_tree->root_layer() && impl_tree->root_layer())
CheckScrollAndClipPointersRecursive(host_tree->root_layer(),
impl_tree->root_layer());
#endif
}
} // namespace cc
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