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// Copyright 2023 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_COMMON_FRAME_SINKS_EXTERNAL_BEGIN_FRAME_SOURCE_IOS_H_
#define COMPONENTS_VIZ_COMMON_FRAME_SINKS_EXTERNAL_BEGIN_FRAME_SOURCE_IOS_H_
#include <memory>
#include "base/time/time.h"
#include "components/viz/common/frame_sinks/begin_frame_args.h"
#include "components/viz/common/frame_sinks/begin_frame_source.h"
#include "components/viz/common/viz_common_export.h"
namespace viz {
// An implementation of ExternalBeginFrameSource which is driven by VSync
// signals coming from CADisplayLink.
class VIZ_COMMON_EXPORT ExternalBeginFrameSourceIOS
: public ExternalBeginFrameSource,
public ExternalBeginFrameSourceClient {
public:
explicit ExternalBeginFrameSourceIOS(uint32_t restart_id);
ExternalBeginFrameSourceIOS(const ExternalBeginFrameSourceIOS&) = delete;
ExternalBeginFrameSourceIOS& operator=(const ExternalBeginFrameSourceIOS&) =
delete;
~ExternalBeginFrameSourceIOS() override;
// ExternalBeginFrameSource override:
void SetPreferredInterval(base::TimeDelta interval) override;
base::TimeDelta GetMinimumFrameInterval() override;
// ExternalBeginFrameSourceClient override.
void OnNeedsBeginFrames(bool needs_begin_frames) override;
// Called by CADisplayLinkImpl whenever there is a VSync update.
void OnVSync(base::TimeTicks vsync_time,
base::TimeTicks next_vsync_time,
base::TimeDelta vsync_interval);
private:
// Toggles VSync updates.
void SetEnabled(bool enabled);
BeginFrameArgsGenerator begin_frame_args_generator_;
struct ObjCStorage;
std::unique_ptr<ObjCStorage> objc_storage_;
};
} // namespace viz
#endif // COMPONENTS_VIZ_COMMON_FRAME_SINKS_EXTERNAL_BEGIN_FRAME_SOURCE_IOS_H_
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