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// Copyright 2011 The Chromium Authors
// 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 <memory>
#include <set>
#include <utility>
#include "base/check_op.h"
#include "base/containers/contains.h"
#include "base/containers/flat_set.h"
#include "base/debug/crash_logging.h"
#include "base/debug/dump_without_crashing.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/layers/picture_layer_impl.h"
#include "cc/trees/layer_tree_host.h"
#include "cc/trees/layer_tree_impl.h"
namespace cc {
namespace {
#if DCHECK_IS_ON()
static void AssertValidPropertyTreeIndices(
const Layer* layer,
const PropertyTrees& property_trees) {
DCHECK(layer);
DCHECK(layer->transform_tree_index_is_valid(property_trees));
DCHECK(layer->effect_tree_index_is_valid(property_trees));
DCHECK(layer->clip_tree_index_is_valid(property_trees));
DCHECK(layer->scroll_tree_index_is_valid(property_trees));
}
static void AssertValidPropertyTreeIndices(const LayerImpl* layer,
const PropertyTrees&) {
DCHECK(layer);
DCHECK_NE(layer->transform_tree_index(), kInvalidPropertyNodeId);
DCHECK_NE(layer->effect_tree_index(), kInvalidPropertyNodeId);
DCHECK_NE(layer->clip_tree_index(), kInvalidPropertyNodeId);
DCHECK_NE(layer->scroll_tree_index(), kInvalidPropertyNodeId);
}
static bool LayerHasValidPropertyTreeIndices(const LayerImpl* layer) {
DCHECK(layer);
return layer->transform_tree_index() != kInvalidPropertyNodeId &&
layer->effect_tree_index() != kInvalidPropertyNodeId &&
layer->clip_tree_index() != kInvalidPropertyNodeId &&
layer->scroll_tree_index() != kInvalidPropertyNodeId;
}
static bool LayerWillPushProperties(const LayerTreeImpl* tree,
const LayerImpl* layer) {
return base::Contains(tree->LayersThatShouldPushProperties(), layer) ||
// TODO(crbug.com/40335690): Stop always pushing PictureLayerImpl
// properties.
base::Contains(tree->picture_layers(), layer);
}
#endif
template <typename LayerType>
std::unique_ptr<LayerImpl> ReuseOrCreateLayerImpl(OwnedLayerImplMap* old_layers,
const 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;
}
void PushLayerList(OwnedLayerImplMap* old_layers,
const CommitState& commit_state,
const ThreadUnsafeCommitState& unsafe_state,
LayerTreeImpl* tree_impl) {
DCHECK(tree_impl->LayerListIsEmpty());
for (const auto* layer : unsafe_state) {
std::unique_ptr<LayerImpl> layer_impl(
ReuseOrCreateLayerImpl(old_layers, layer, tree_impl));
// TODO(crbug.com/40778609): remove diagnostic CHECK
CHECK(layer_impl);
#if DCHECK_IS_ON()
// Every layer should have valid property tree indices
AssertValidPropertyTreeIndices(layer, unsafe_state.property_trees);
// Every layer_impl should either have valid property tree indices already
// or the corresponding layer should push them onto layer_impl.
DCHECK(LayerHasValidPropertyTreeIndices(layer_impl.get()) ||
commit_state.layers_that_should_push_properties.contains(layer));
#endif
tree_impl->AddLayer(std::move(layer_impl));
}
tree_impl->OnCanDrawStateChangedForTree();
}
void PushLayerList(OwnedLayerImplMap* old_layers,
LayerTreeImpl* host,
LayerTreeImpl* tree_impl,
const PropertyTrees& property_trees) {
DCHECK(tree_impl->LayerListIsEmpty());
for (const auto* layer : *host) {
std::unique_ptr<LayerImpl> layer_impl(
ReuseOrCreateLayerImpl(old_layers, layer, tree_impl));
// TODO(crbug.com/40778609): remove diagnostic CHECK
CHECK(layer_impl);
#if DCHECK_IS_ON()
// Every layer should have valid property tree indices
AssertValidPropertyTreeIndices(layer, property_trees);
// Every layer_impl should either have valid property tree indices already
// or the corresponding layer should push them onto layer_impl.
DCHECK(LayerHasValidPropertyTreeIndices(layer_impl.get()) ||
LayerWillPushProperties(host, layer));
#endif
tree_impl->AddLayer(std::move(layer_impl));
}
tree_impl->OnCanDrawStateChangedForTree();
}
void SynchronizeTreesInternal(const CommitState& commit_state,
const ThreadUnsafeCommitState& unsafe_state,
LayerTreeImpl* tree_impl) {
DCHECK(tree_impl);
TRACE_EVENT0("cc", "TreeSynchronizer::SynchronizeTrees");
OwnedLayerImplList old_layers = tree_impl->DetachLayers();
OwnedLayerImplMap old_layer_map;
for (auto& it : old_layers) {
DCHECK(it);
old_layer_map[it->id()] = std::move(it);
}
PushLayerList(&old_layer_map, commit_state, unsafe_state, tree_impl);
}
void SynchronizeTreesInternal(LayerTreeImpl* source_tree,
LayerTreeImpl* tree_impl,
const PropertyTrees& property_trees) {
DCHECK(tree_impl);
TRACE_EVENT0("cc", "TreeSynchronizer::SynchronizeTrees");
OwnedLayerImplList old_layers = tree_impl->DetachLayers();
OwnedLayerImplMap old_layer_map;
for (auto& it : old_layers) {
DCHECK(it);
old_layer_map[it->id()] = std::move(it);
}
PushLayerList(&old_layer_map, source_tree, tree_impl, property_trees);
}
} // namespace
void TreeSynchronizer::SynchronizeTrees(
const CommitState& commit_state,
const ThreadUnsafeCommitState& unsafe_state,
LayerTreeImpl* tree_impl) {
if (!unsafe_state.root_layer) {
tree_impl->DetachLayers();
} else {
SynchronizeTreesInternal(commit_state, unsafe_state, tree_impl);
}
}
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 Iterator>
static void PushLayerPropertiesInternal(Iterator source_layers_begin,
Iterator source_layers_end,
LayerTreeImpl* target_impl_tree) {
for (Iterator it = source_layers_begin; it != source_layers_end; ++it) {
auto& source_layer = *it;
LayerImpl* target_layer = target_impl_tree->LayerById(source_layer->id());
DCHECK(target_layer);
source_layer->PushPropertiesTo(target_layer);
}
}
void TreeSynchronizer::PushLayerProperties(LayerTreeImpl* pending_tree,
LayerTreeImpl* active_tree) {
const auto& layers = pending_tree->LayersThatShouldPushProperties();
const auto& picture_layers = pending_tree->picture_layers();
const size_t push_count =
layers.size() + (pending_tree->always_push_properties_on_picture_layers()
? picture_layers.size()
: 0);
TRACE_EVENT1("cc", "TreeSynchronizer::PushLayerPropertiesTo.Impl",
"layer_count", push_count);
PushLayerPropertiesInternal(layers.begin(), layers.end(), active_tree);
if (pending_tree->always_push_properties_on_picture_layers()) {
// TODO(crbug.com/40335690): Stop always pushing PictureLayerImpl
// properties.
PushLayerPropertiesInternal(picture_layers.begin(), picture_layers.end(),
active_tree);
}
pending_tree->ClearLayersThatShouldPushProperties();
}
void TreeSynchronizer::PushLayerProperties(
const CommitState& commit_state,
const ThreadUnsafeCommitState& unsafe_state,
LayerTreeImpl* impl_tree) {
TRACE_EVENT1("cc", "TreeSynchronizer::PushLayerPropertiesTo.Main",
"layer_count",
commit_state.layers_that_should_push_properties.size());
auto source_layers_begin =
commit_state.layers_that_should_push_properties.begin();
auto source_layers_end =
commit_state.layers_that_should_push_properties.end();
for (auto it = source_layers_begin; it != source_layers_end; ++it) {
auto* source_layer = *it;
LayerImpl* target_layer = impl_tree->LayerById(source_layer->id());
CHECK(target_layer);
source_layer->PushPropertiesTo(target_layer, commit_state, unsafe_state);
}
}
} // namespace cc
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