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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_VIZ_SERVICE_FRAME_SINKS_EXTERNAL_BEGIN_FRAME_SOURCE_MOJO_H_
#define COMPONENTS_VIZ_SERVICE_FRAME_SINKS_EXTERNAL_BEGIN_FRAME_SOURCE_MOJO_H_
#include <optional>
#include "base/containers/flat_set.h"
#include "base/memory/raw_ptr.h"
#include "components/viz/common/frame_sinks/begin_frame_args.h"
#include "components/viz/common/frame_sinks/begin_frame_source.h"
#include "components/viz/service/display/display.h"
#include "components/viz/service/frame_sinks/frame_sink_observer.h"
#include "mojo/public/cpp/bindings/associated_receiver.h"
#include "mojo/public/cpp/bindings/associated_remote.h"
#include "mojo/public/cpp/bindings/pending_associated_receiver.h"
#include "mojo/public/cpp/bindings/pending_associated_remote.h"
#include "services/viz/privileged/mojom/compositing/external_begin_frame_controller.mojom.h"
namespace viz {
class FrameSinkManagerImpl;
// Implementation of ExternalBeginFrameSource that's controlled by IPCs over
// the mojom::ExternalBeginFrameController interface. Replaces the Display's
// default BeginFrameSource. Observes the Display to be notified of BeginFrame
// completion.
class VIZ_SERVICE_EXPORT ExternalBeginFrameSourceMojo
: public mojom::ExternalBeginFrameController,
public DisplayObserver,
public ExternalBeginFrameSource,
public ExternalBeginFrameSourceClient,
public FrameSinkObserver {
public:
// `controller_receiver` must be a valid mojo receiver.
// `controller_client_remote` is optional and can be an invalid remote.
ExternalBeginFrameSourceMojo(
FrameSinkManagerImpl* frame_sink_manager,
mojo::PendingAssociatedReceiver<mojom::ExternalBeginFrameController>
controller_receiver,
mojo::PendingAssociatedRemote<mojom::ExternalBeginFrameControllerClient>
controller_client_remote,
uint32_t restart_id);
~ExternalBeginFrameSourceMojo() override;
// mojom::ExternalBeginFrameController implementation.
void IssueExternalBeginFrame(
const BeginFrameArgs& args,
bool force,
base::OnceCallback<void(const BeginFrameAck&)> callback) override;
void SetDisplay(Display* display);
private:
// ExternalBeginFrameSourceClient implementation.
void OnNeedsBeginFrames(bool needs_begin_frames) override;
void SetPreferredInterval(base::TimeDelta interval) override;
// DisplayObserver overrides.
void OnDisplayDidFinishFrame(const BeginFrameAck& ack) override;
void OnDisplayDestroyed() override;
// FrameSinkObserver overrides.
void OnDestroyedCompositorFrameSink(
const FrameSinkId& frame_sink_id) override;
void OnFrameSinkDidBeginFrame(const FrameSinkId& frame_sink_id,
const BeginFrameArgs& args) override;
void OnFrameSinkDidFinishFrame(const FrameSinkId& frame_sink_id,
const BeginFrameArgs& args) override;
void MaybeProduceFrameCallback();
void DispatchFrameCallback(const BeginFrameAck& ack);
const raw_ptr<FrameSinkManagerImpl> frame_sink_manager_;
// The pending_frame_callback_ needs to be destroyed after the mojo receiver,
// or else we may get a DCHECK that the callback was dropped while the
// receiver is open. Since destruction order is well defined, ensuring that
// the callback is listed before the receiver is enough to guarantee this.
base::OnceCallback<void(const BeginFrameAck& ack)> pending_frame_callback_;
mojo::AssociatedReceiver<mojom::ExternalBeginFrameController> receiver_;
mojo::AssociatedRemote<mojom::ExternalBeginFrameControllerClient>
remote_client_;
// The frame source id as specified in BeginFrameArgs passed to
// IssueExternalBeginFrame. Note this is likely to be different from our
// source id, but this is what will be reported to FrameSinkObserver methods.
uint64_t original_source_id_ = BeginFrameArgs::kStartingSourceId;
base::flat_set<FrameSinkId> pending_frame_sinks_;
std::optional<BeginFrameAck> pending_ack_;
raw_ptr<Display> display_ = nullptr;
};
} // namespace viz
#endif // COMPONENTS_VIZ_SERVICE_FRAME_SINKS_EXTERNAL_BEGIN_FRAME_SOURCE_MOJO_H_
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