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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 LayerTreeType>
void SynchronizeTreesInternal(LayerTreeType* source_tree,
LayerTreeImpl* tree_impl,
PropertyTrees* property_trees) {
DCHECK(tree_impl);
TRACE_EVENT0("cc", "TreeSynchronizer::SynchronizeTrees");
std::unique_ptr<OwnedLayerImplList> old_layers(tree_impl->DetachLayers());
OwnedLayerImplMap old_layer_map;
for (auto& it : *old_layers)
old_layer_map[it->id()] = std::move(it);
PushLayerList(&old_layer_map, source_tree, tree_impl);
for (int id : property_trees->effect_tree.mask_layer_ids()) {
std::unique_ptr<LayerImpl> layer_impl(ReuseOrCreateLayerImpl(
&old_layer_map, source_tree->LayerById(id), tree_impl));
tree_impl->AddLayer(std::move(layer_impl));
}
}
void TreeSynchronizer::SynchronizeTrees(Layer* layer_root,
LayerTreeImpl* tree_impl) {
if (!layer_root) {
tree_impl->DetachLayers();
} else {
SynchronizeTreesInternal(layer_root->layer_tree_host(), tree_impl,
layer_root->layer_tree_host()->property_trees());
}
}
void TreeSynchronizer::SynchronizeTrees(LayerTreeImpl* pending_tree,
LayerTreeImpl* active_tree) {
if (pending_tree->LayerListIsEmpty()) {
active_tree->DetachLayers();
} else {
SynchronizeTreesInternal(pending_tree, active_tree,
pending_tree->property_trees());
}
}
template <typename LayerType>
std::unique_ptr<LayerImpl> ReuseOrCreateLayerImpl(OwnedLayerImplMap* old_layers,
LayerType* layer,
LayerTreeImpl* tree_impl) {
if (!layer)
return nullptr;
std::unique_ptr<LayerImpl> layer_impl = std::move((*old_layers)[layer->id()]);
if (!layer_impl)
layer_impl = layer->CreateLayerImpl(tree_impl);
return layer_impl;
}
template <typename LayerTreeType>
void PushLayerList(OwnedLayerImplMap* old_layers,
LayerTreeType* host,
LayerTreeImpl* tree_impl) {
tree_impl->ClearLayerList();
for (auto* layer : *host) {
std::unique_ptr<LayerImpl> layer_impl(
ReuseOrCreateLayerImpl(old_layers, layer, tree_impl));
tree_impl->AddToLayerList(layer_impl.get());
tree_impl->AddLayer(std::move(layer_impl));
}
tree_impl->OnCanDrawStateChangedForTree();
}
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);
}
} // namespace cc
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