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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 <stdint.h>
#include <list>
#include <memory>
#include <unordered_map>
#include <unordered_set>
#include <vector>
#include "base/macros.h"
#include "base/observer_list.h"
#include "base/threading/thread_checker.h"
#include "cc/surfaces/surface_damage_observer.h"
#include "cc/surfaces/surface_id.h"
#include "cc/surfaces/surface_sequence.h"
#include "cc/surfaces/surfaces_export.h"
namespace cc {
class BeginFrameSource;
class CompositorFrame;
class Surface;
class SurfaceFactoryClient;
class CC_SURFACES_EXPORT SurfaceManager {
void RegisterSurface(Surface* surface);
void DeregisterSurface(const SurfaceId& surface_id);
// Destroy the Surface once a set of sequence numbers has been satisfied.
void Destroy(std::unique_ptr<Surface> surface);
Surface* GetSurfaceForId(const SurfaceId& surface_id);
void AddObserver(SurfaceDamageObserver* obs) {
void RemoveObserver(SurfaceDamageObserver* obs) {
bool SurfaceModified(const SurfaceId& surface_id);
// A frame for a surface satisfies a set of sequence numbers in a particular
// id namespace.
void DidSatisfySequences(uint32_t client_id, std::vector<uint32_t>* sequence);
void RegisterSurfaceClientId(uint32_t client_id);
// Invalidate a namespace that might still have associated sequences,
// possibly because a renderer process has crashed.
void InvalidateSurfaceClientId(uint32_t client_id);
// SurfaceFactoryClient, hierarchy, and BeginFrameSource can be registered
// and unregistered in any order with respect to each other.
// This happens in practice, e.g. the relationship to between ui::Compositor /
// DelegatedFrameHost is known before ui::Compositor has a surface/client).
// However, DelegatedFrameHost can register itself as a client before its
// relationship with the ui::Compositor is known.
// Associates a SurfaceFactoryClient with the surface id namespace it uses.
// SurfaceFactoryClient and surface namespaces/allocators have a 1:1 mapping.
// Caller guarantees the client is alive between register/unregister.
// Reregistering the same namespace when a previous client is active is not
// valid.
void RegisterSurfaceFactoryClient(uint32_t client_id,
SurfaceFactoryClient* client);
void UnregisterSurfaceFactoryClient(uint32_t client_id);
// Associates a |source| with a particular namespace. That namespace and
// any children of that namespace with valid clients can potentially use
// that |source|.
void RegisterBeginFrameSource(BeginFrameSource* source, uint32_t client_id);
void UnregisterBeginFrameSource(BeginFrameSource* source);
// Register a relationship between two namespaces. This relationship means
// that surfaces from the child namespace will be displayed in the parent.
// Children are allowed to use any begin frame source that their parent can
// use.
void RegisterSurfaceNamespaceHierarchy(uint32_t parent_namespace,
uint32_t child_namespace);
void UnregisterSurfaceNamespaceHierarchy(uint32_t parent_namespace,
uint32_t child_namespace);
void RecursivelyAttachBeginFrameSource(uint32_t client_id,
BeginFrameSource* source);
void RecursivelyDetachBeginFrameSource(uint32_t client_id,
BeginFrameSource* source);
// Returns true if |child namespace| is or has |search_namespace| as a child.
bool ChildContains(uint32_t child_namespace, uint32_t search_namespace) const;
void GarbageCollectSurfaces();
using SurfaceMap = std::unordered_map<SurfaceId, Surface*, SurfaceIdHash>;
SurfaceMap surface_map_;
base::ObserverList<SurfaceDamageObserver> observer_list_;
base::ThreadChecker thread_checker_;
// List of surfaces to be destroyed, along with what sequences they're still
// waiting on.
using SurfaceDestroyList = std::list<std::unique_ptr<Surface>>;
SurfaceDestroyList surfaces_to_destroy_;
// Set of SurfaceSequences that have been satisfied by a frame but not yet
// waited on.
std::unordered_set<SurfaceSequence, SurfaceSequenceHash> satisfied_sequences_;
// Set of valid surface ID namespaces. When a namespace is removed from
// this set, any remaining sequences with that namespace are considered
// satisfied.
std::unordered_set<uint32_t> valid_surface_client_ids_;
// Begin frame source routing. Both BeginFrameSource and SurfaceFactoryClient
// pointers guaranteed alive by callers until unregistered.
struct ClientSourceMapping {
ClientSourceMapping(const ClientSourceMapping& other);
bool is_empty() const { return !client && children.empty(); }
// The client that's responsible for creating this namespace. Never null.
SurfaceFactoryClient* client;
// The currently assigned begin frame source for this client.
BeginFrameSource* source;
// This represents a dag of parent -> children mapping.
std::vector<uint32_t> children;
std::unordered_map<uint32_t, ClientSourceMapping> namespace_client_map_;
// Set of which sources are registered to which namespace. Any child
// that is implicitly using this namespace must be reachable by the
// parent in the dag.
std::unordered_map<BeginFrameSource*, uint32_t> registered_sources_;
} // namespace cc