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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/check_op.h"
#include "base/containers/flat_set.h"
#include "base/debug/crash_logging.h"
#include "base/debug/dump_without_crashing.h"
#include "base/stl_util.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 {
namespace {
#if DCHECK_IS_ON()
template <typename LayerType>
static void AssertValidPropertyTreeIndices(LayerType* layer) {
DCHECK(layer);
DCHECK_NE(layer->transform_tree_index(), TransformTree::kInvalidNodeId);
DCHECK_NE(layer->effect_tree_index(), EffectTree::kInvalidNodeId);
DCHECK_NE(layer->clip_tree_index(), ClipTree::kInvalidNodeId);
DCHECK_NE(layer->scroll_tree_index(), ScrollTree::kInvalidNodeId);
}
static bool LayerHasValidPropertyTreeIndices(LayerImpl* layer) {
DCHECK(layer);
return layer->transform_tree_index() != TransformTree::kInvalidNodeId &&
layer->effect_tree_index() != EffectTree::kInvalidNodeId &&
layer->clip_tree_index() != ClipTree::kInvalidNodeId &&
layer->scroll_tree_index() != ScrollTree::kInvalidNodeId;
}
static bool LayerWillPushProperties(LayerTreeHost* host, Layer* layer) {
return base::Contains(host->LayersThatShouldPushProperties(), layer);
}
static bool LayerWillPushProperties(LayerTreeImpl* tree, LayerImpl* layer) {
return base::Contains(tree->LayersThatShouldPushProperties(), layer) ||
// TODO(crbug.com/303943): Stop always pushing PictureLayerImpl
// properties.
base::Contains(tree->picture_layers(), layer);
}
#endif
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) {
DCHECK(tree_impl->LayerListIsEmpty());
for (auto* layer : *host) {
std::unique_ptr<LayerImpl> layer_impl(
ReuseOrCreateLayerImpl(old_layers, layer, tree_impl));
#if DCHECK_IS_ON()
// Every layer should have valid property tree indices
AssertValidPropertyTreeIndices(layer);
// 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();
}
template <typename LayerTreeType>
void SynchronizeTreesInternal(LayerTreeType* source_tree,
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, source_tree, tree_impl);
}
} // namespace
void TreeSynchronizer::SynchronizeTrees(Layer* layer_root,
LayerTreeImpl* tree_impl) {
if (!layer_root) {
tree_impl->DetachLayers();
} else {
SynchronizeTreesInternal(layer_root->layer_tree_host(), tree_impl);
}
}
void TreeSynchronizer::SynchronizeTrees(LayerTreeImpl* pending_tree,
LayerTreeImpl* active_tree) {
if (pending_tree->LayerListIsEmpty()) {
active_tree->DetachLayers();
} else {
SynchronizeTreesInternal(pending_tree, active_tree);
}
}
template <typename Iterator>
static void PushLayerPropertiesInternal(Iterator source_layers_begin,
Iterator source_layers_end,
LayerTreeHost* host_tree,
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);
// TODO(enne): http://crbug.com/918126 debugging
CHECK(source_layer);
if (!target_layer) {
bool host_set_on_source = source_layer->layer_tree_host() == host_tree;
bool source_found_by_iterator = false;
for (auto host_tree_it = host_tree->begin();
host_tree_it != host_tree->end(); ++it) {
if (*host_tree_it == source_layer) {
source_found_by_iterator = true;
break;
}
}
bool root_layer_valid = !!host_tree->root_layer();
bool found_root = false;
Layer* layer = source_layer;
while (layer) {
if (layer == host_tree->root_layer()) {
found_root = true;
break;
}
layer = layer->parent();
}
auto str = base::StringPrintf(
"hs: %d, sf: %d, rlv: %d, fr: %d", host_set_on_source,
source_found_by_iterator, root_layer_valid, found_root);
static auto* crash_key = base::debug::AllocateCrashKeyString(
"cc_null_layer_sync", base::debug::CrashKeySize::Size32);
base::debug::SetCrashKeyString(crash_key, str);
base::debug::DumpWithoutCrashing();
}
source_layer->PushPropertiesTo(target_layer);
}
}
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();
// TODO(crbug.com/303943): Stop always pushing PictureLayerImpl properties.
const auto& picture_layers = pending_tree->picture_layers();
TRACE_EVENT1("cc", "TreeSynchronizer::PushLayerPropertiesTo.Impl",
"layer_count", layers.size() + picture_layers.size());
PushLayerPropertiesInternal(layers.begin(), layers.end(), active_tree);
PushLayerPropertiesInternal(picture_layers.begin(), picture_layers.end(),
active_tree);
pending_tree->ClearLayersThatShouldPushProperties();
}
void TreeSynchronizer::PushLayerProperties(LayerTreeHost* host_tree,
LayerTreeImpl* impl_tree) {
auto layers = host_tree->LayersThatShouldPushProperties();
TRACE_EVENT1("cc", "TreeSynchronizer::PushLayerPropertiesTo.Main",
"layer_count", layers.size());
PushLayerPropertiesInternal(layers.begin(), layers.end(), host_tree,
impl_tree);
host_tree->ClearLayersThatShouldPushProperties();
}
} // namespace cc
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