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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_COMPOSITOR_HOST_BEGIN_FRAME_OBSERVER_H_
#define UI_COMPOSITOR_HOST_BEGIN_FRAME_OBSERVER_H_
#include "base/observer_list.h"
#include "mojo/public/cpp/bindings/receiver.h"
#include "services/viz/privileged/mojom/compositing/begin_frame_observer.mojom.h"
#include "ui/compositor/compositor_export.h"
namespace base {
class TimeTicks;
class TimeDelta;
} // namespace base
namespace ui {
// A BeginFrameObserver implementation that forwards begin frame messages to
// registered sub-SimpleBeginFrameObservers.
//
// In case the host thread is slow, frame message scan get queued up.
// Provides coalescing of begin frame messages in this case, by gathering
// pending messages into a single message call.
class COMPOSITOR_EXPORT HostBeginFrameObserver
: public viz::mojom::BeginFrameObserver {
public:
class SimpleBeginFrameObserver : public base::CheckedObserver {
public:
~SimpleBeginFrameObserver() override = default;
virtual void OnBeginFrame(
base::TimeTicks frame_begin_time,
base::TimeDelta frame_interval,
// Non-empty if more than one begin frame were coalesced.
std::optional<base::TimeTicks> first_coalesced_frame_begin_time) = 0;
virtual void OnBeginFrameSourceShuttingDown() = 0;
};
using SimpleBeginFrameObserverList =
base::ObserverList<ui::HostBeginFrameObserver::SimpleBeginFrameObserver,
true>;
HostBeginFrameObserver(
SimpleBeginFrameObserverList& observers,
scoped_refptr<base::SingleThreadTaskRunner> task_runner);
~HostBeginFrameObserver() override;
void OnStandaloneBeginFrame(const viz::BeginFrameArgs& args) override;
mojo::PendingRemote<viz::mojom::BeginFrameObserver> GetBoundRemote();
private:
void CoalescedBeginFrame();
void CallObservers(
const viz::BeginFrameArgs& args,
std::optional<const base::TimeTicks> first_coalesced_begin_frame_time);
const raw_ref<SimpleBeginFrameObserverList> simple_begin_frame_observers_;
const scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
bool pending_coalesce_callback_ = false;
std::optional<base::TimeTicks> first_coalesced_begin_frame_time_;
viz::BeginFrameArgs begin_frame_args_;
uint64_t coalesce_flow_id_ = ~0ull;
mojo::Receiver<viz::mojom::BeginFrameObserver> receiver_{this};
base::WeakPtrFactory<HostBeginFrameObserver> weak_factory_{this};
};
} // namespace ui
#endif // UI_COMPOSITOR_HOST_BEGIN_FRAME_OBSERVER_H_
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