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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/surface_manager.h"
#include <stddef.h>
#include <stdint.h>
#include "base/logging.h"
#include "cc/surfaces/surface.h"
#include "cc/surfaces/surface_id_allocator.h"
namespace cc {
SurfaceManager::SurfaceManager() {
thread_checker_.DetachFromThread();
}
SurfaceManager::~SurfaceManager() {
DCHECK(thread_checker_.CalledOnValidThread());
for (SurfaceDestroyList::iterator it = surfaces_to_destroy_.begin();
it != surfaces_to_destroy_.end();
++it) {
DeregisterSurface((*it)->surface_id());
delete *it;
}
}
void SurfaceManager::RegisterSurface(Surface* surface) {
DCHECK(thread_checker_.CalledOnValidThread());
DCHECK(surface);
DCHECK(!surface_map_.count(surface->surface_id()));
surface_map_[surface->surface_id()] = surface;
}
void SurfaceManager::DeregisterSurface(SurfaceId surface_id) {
DCHECK(thread_checker_.CalledOnValidThread());
SurfaceMap::iterator it = surface_map_.find(surface_id);
DCHECK(it != surface_map_.end());
surface_map_.erase(it);
}
void SurfaceManager::Destroy(scoped_ptr<Surface> surface) {
DCHECK(thread_checker_.CalledOnValidThread());
surface->set_destroyed(true);
surfaces_to_destroy_.push_back(surface.release());
GarbageCollectSurfaces();
}
void SurfaceManager::DidSatisfySequences(uint32_t id_namespace,
std::vector<uint32_t>* sequence) {
DCHECK(thread_checker_.CalledOnValidThread());
for (std::vector<uint32_t>::iterator it = sequence->begin();
it != sequence->end();
++it) {
satisfied_sequences_.insert(SurfaceSequence(id_namespace, *it));
}
sequence->clear();
GarbageCollectSurfaces();
}
void SurfaceManager::RegisterSurfaceIdNamespace(uint32_t id_namespace) {
bool inserted = valid_surface_id_namespaces_.insert(id_namespace).second;
DCHECK(inserted);
}
void SurfaceManager::InvalidateSurfaceIdNamespace(uint32_t id_namespace) {
valid_surface_id_namespaces_.erase(id_namespace);
GarbageCollectSurfaces();
}
void SurfaceManager::GarbageCollectSurfaces() {
// Simple mark and sweep GC.
// TODO(jbauman): Reduce the amount of work when nothing needs to be
// destroyed.
std::vector<SurfaceId> live_surfaces;
std::set<SurfaceId> live_surfaces_set;
// GC roots are surfaces that have not been destroyed, or have not had all
// their destruction dependencies satisfied.
for (auto& map_entry : surface_map_) {
map_entry.second->SatisfyDestructionDependencies(
&satisfied_sequences_, &valid_surface_id_namespaces_);
if (!map_entry.second->destroyed() ||
map_entry.second->GetDestructionDependencyCount()) {
live_surfaces_set.insert(map_entry.first);
live_surfaces.push_back(map_entry.first);
}
}
// Mark all surfaces reachable from live surfaces by adding them to
// live_surfaces and live_surfaces_set.
for (size_t i = 0; i < live_surfaces.size(); i++) {
Surface* surf = surface_map_[live_surfaces[i]];
DCHECK(surf);
for (SurfaceId id : surf->referenced_surfaces()) {
if (live_surfaces_set.count(id))
continue;
Surface* surf2 = GetSurfaceForId(id);
if (surf2) {
live_surfaces.push_back(id);
live_surfaces_set.insert(id);
}
}
}
// Destroy all remaining unreachable surfaces.
for (SurfaceDestroyList::iterator dest_it = surfaces_to_destroy_.begin();
dest_it != surfaces_to_destroy_.end();) {
if (!live_surfaces_set.count((*dest_it)->surface_id())) {
scoped_ptr<Surface> surf(*dest_it);
DeregisterSurface(surf->surface_id());
dest_it = surfaces_to_destroy_.erase(dest_it);
} else {
++dest_it;
}
}
}
Surface* SurfaceManager::GetSurfaceForId(SurfaceId surface_id) {
DCHECK(thread_checker_.CalledOnValidThread());
SurfaceMap::iterator it = surface_map_.find(surface_id);
if (it == surface_map_.end())
return NULL;
return it->second;
}
bool SurfaceManager::SurfaceModified(SurfaceId surface_id) {
DCHECK(thread_checker_.CalledOnValidThread());
bool changed = false;
FOR_EACH_OBSERVER(SurfaceDamageObserver, observer_list_,
OnSurfaceDamaged(surface_id, &changed));
return changed;
}
} // namespace cc
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