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// Copyright 2014 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/surfaces/framesink_manager.h"
#include <stddef.h>
#include <stdint.h>
#include "base/logging.h"
#include "cc/surfaces/surface_factory_client.h"
#if DCHECK_IS_ON()
#include <sstream>
#endif
namespace cc {
FrameSinkManager::FrameSinkSourceMapping::FrameSinkSourceMapping()
: source(nullptr) {}
FrameSinkManager::FrameSinkSourceMapping::FrameSinkSourceMapping(
const FrameSinkSourceMapping& other) = default;
FrameSinkManager::FrameSinkSourceMapping::~FrameSinkSourceMapping() {
}
FrameSinkManager::FrameSinkManager() {}
FrameSinkManager::~FrameSinkManager() {
// All surface factory clients should be unregistered prior to SurfaceManager
// destruction.
DCHECK_EQ(clients_.size(), 0u);
DCHECK_EQ(registered_sources_.size(), 0u);
}
void FrameSinkManager::RegisterFrameSinkId(const FrameSinkId& frame_sink_id) {
bool inserted = valid_frame_sink_ids_.insert(frame_sink_id).second;
DCHECK(inserted);
}
void FrameSinkManager::InvalidateFrameSinkId(const FrameSinkId& frame_sink_id) {
valid_frame_sink_ids_.erase(frame_sink_id);
}
void FrameSinkManager::RegisterSurfaceFactoryClient(
const FrameSinkId& frame_sink_id,
SurfaceFactoryClient* client) {
DCHECK(client);
DCHECK_EQ(valid_frame_sink_ids_.count(frame_sink_id), 1u);
clients_[frame_sink_id] = client;
auto it = frame_sink_source_map_.find(frame_sink_id);
if (it != frame_sink_source_map_.end()) {
if (it->second.source)
client->SetBeginFrameSource(it->second.source);
}
}
void FrameSinkManager::UnregisterSurfaceFactoryClient(
const FrameSinkId& frame_sink_id) {
DCHECK_EQ(valid_frame_sink_ids_.count(frame_sink_id), 1u);
auto client_iter = clients_.find(frame_sink_id);
DCHECK(client_iter != clients_.end());
auto source_iter = frame_sink_source_map_.find(frame_sink_id);
if (source_iter != frame_sink_source_map_.end()) {
if (source_iter->second.source)
client_iter->second->SetBeginFrameSource(nullptr);
if (!source_iter->second.has_children())
frame_sink_source_map_.erase(source_iter);
}
clients_.erase(client_iter);
}
void FrameSinkManager::RegisterBeginFrameSource(
BeginFrameSource* source,
const FrameSinkId& frame_sink_id) {
DCHECK(source);
DCHECK_EQ(registered_sources_.count(source), 0u);
DCHECK_EQ(valid_frame_sink_ids_.count(frame_sink_id), 1u);
registered_sources_[source] = frame_sink_id;
RecursivelyAttachBeginFrameSource(frame_sink_id, source);
}
void FrameSinkManager::UnregisterBeginFrameSource(BeginFrameSource* source) {
DCHECK(source);
DCHECK_EQ(registered_sources_.count(source), 1u);
FrameSinkId frame_sink_id = registered_sources_[source];
registered_sources_.erase(source);
if (frame_sink_source_map_.count(frame_sink_id) == 0u)
return;
// TODO(enne): these walks could be done in one step.
// Remove this begin frame source from its subtree.
RecursivelyDetachBeginFrameSource(frame_sink_id, source);
// Then flush every remaining registered source to fix any sources that
// became null because of the previous step but that have an alternative.
for (auto source_iter : registered_sources_)
RecursivelyAttachBeginFrameSource(source_iter.second, source_iter.first);
}
void FrameSinkManager::RecursivelyAttachBeginFrameSource(
const FrameSinkId& frame_sink_id,
BeginFrameSource* source) {
FrameSinkSourceMapping& mapping = frame_sink_source_map_[frame_sink_id];
if (!mapping.source) {
mapping.source = source;
auto client_iter = clients_.find(frame_sink_id);
if (client_iter != clients_.end())
client_iter->second->SetBeginFrameSource(source);
}
for (size_t i = 0; i < mapping.children.size(); ++i)
RecursivelyAttachBeginFrameSource(mapping.children[i], source);
}
void FrameSinkManager::RecursivelyDetachBeginFrameSource(
const FrameSinkId& frame_sink_id,
BeginFrameSource* source) {
auto iter = frame_sink_source_map_.find(frame_sink_id);
if (iter == frame_sink_source_map_.end())
return;
if (iter->second.source == source) {
iter->second.source = nullptr;
auto client_iter = clients_.find(frame_sink_id);
if (client_iter != clients_.end())
client_iter->second->SetBeginFrameSource(nullptr);
}
if (!iter->second.has_children() && !clients_.count(frame_sink_id)) {
frame_sink_source_map_.erase(iter);
return;
}
std::vector<FrameSinkId>& children = iter->second.children;
for (size_t i = 0; i < children.size(); ++i) {
RecursivelyDetachBeginFrameSource(children[i], source);
}
}
bool FrameSinkManager::ChildContains(
const FrameSinkId& child_frame_sink_id,
const FrameSinkId& search_frame_sink_id) const {
auto iter = frame_sink_source_map_.find(child_frame_sink_id);
if (iter == frame_sink_source_map_.end())
return false;
const std::vector<FrameSinkId>& children = iter->second.children;
for (size_t i = 0; i < children.size(); ++i) {
if (children[i] == search_frame_sink_id)
return true;
if (ChildContains(children[i], search_frame_sink_id))
return true;
}
return false;
}
void FrameSinkManager::RegisterFrameSinkHierarchy(
const FrameSinkId& parent_frame_sink_id,
const FrameSinkId& child_frame_sink_id) {
// If it's possible to reach the parent through the child's descendant chain,
// then this will create an infinite loop. Might as well just crash here.
CHECK(!ChildContains(child_frame_sink_id, parent_frame_sink_id));
std::vector<FrameSinkId>& children =
frame_sink_source_map_[parent_frame_sink_id].children;
for (size_t i = 0; i < children.size(); ++i)
DCHECK(children[i] != child_frame_sink_id);
children.push_back(child_frame_sink_id);
// If the parent has no source, then attaching it to this child will
// not change any downstream sources.
BeginFrameSource* parent_source =
frame_sink_source_map_[parent_frame_sink_id].source;
if (!parent_source)
return;
DCHECK_EQ(registered_sources_.count(parent_source), 1u);
RecursivelyAttachBeginFrameSource(child_frame_sink_id, parent_source);
}
void FrameSinkManager::UnregisterFrameSinkHierarchy(
const FrameSinkId& parent_frame_sink_id,
const FrameSinkId& child_frame_sink_id) {
// Deliberately do not check validity of either parent or child FrameSinkId
// here. They were valid during the registration, so were valid at some
// point in time. This makes it possible to invalidate parent and child
// FrameSinkIds independently of each other and not have an ordering
// dependency of unregistering the hierarchy first before either of them.
DCHECK_EQ(frame_sink_source_map_.count(parent_frame_sink_id), 1u);
auto iter = frame_sink_source_map_.find(parent_frame_sink_id);
std::vector<FrameSinkId>& children = iter->second.children;
bool found_child = false;
for (size_t i = 0; i < children.size(); ++i) {
if (children[i] == child_frame_sink_id) {
found_child = true;
children[i] = children.back();
children.resize(children.size() - 1);
break;
}
}
DCHECK(found_child);
// The SurfaceFactoryClient and hierarchy can be registered/unregistered
// in either order, so empty frame_sink_source_map entries need to be
// checked when removing either clients or relationships.
if (!iter->second.has_children() && !clients_.count(parent_frame_sink_id) &&
!iter->second.source) {
frame_sink_source_map_.erase(iter);
return;
}
// If the parent does not have a begin frame source, then disconnecting it
// will not change any of its children.
BeginFrameSource* parent_source = iter->second.source;
if (!parent_source)
return;
// TODO(enne): these walks could be done in one step.
RecursivelyDetachBeginFrameSource(child_frame_sink_id, parent_source);
for (auto source_iter : registered_sources_)
RecursivelyAttachBeginFrameSource(source_iter.second, source_iter.first);
}
} // namespace cc
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