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// Copyright 2013 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.
#ifndef CC_SCHEDULER_VSYNC_TIME_SOURCE_H_
#define CC_SCHEDULER_VSYNC_TIME_SOURCE_H_
#include "cc/base/cc_export.h"
#include "cc/scheduler/time_source.h"
namespace cc {
class CC_EXPORT VSyncClient {
public:
virtual void DidVSync(base::TimeTicks frame_time) = 0;
protected:
virtual ~VSyncClient() {}
};
class VSyncProvider {
public:
// Request to be notified of future vsync events. The notifications will be
// delivered until they are disabled by calling this function with a null
// client.
virtual void RequestVSyncNotification(VSyncClient* client) = 0;
protected:
virtual ~VSyncProvider() {}
};
// This timer implements a time source that is explicitly triggered by an
// external vsync signal.
class CC_EXPORT VSyncTimeSource : public TimeSource, public VSyncClient {
public:
enum NotificationDisableOption {
// The notification will be lazily disabled in the callback to ensure
// we get notified of the frame immediately following a quick on-off-on
// transition.
DISABLE_ON_NEXT_TICK,
DISABLE_SYNCHRONOUSLY
};
static scoped_refptr<VSyncTimeSource> Create(
VSyncProvider* vsync_provider, NotificationDisableOption option);
// TimeSource implementation
virtual void SetClient(TimeSourceClient* client) OVERRIDE;
virtual void SetTimebaseAndInterval(base::TimeTicks timebase,
base::TimeDelta interval) OVERRIDE;
virtual void SetActive(bool active) OVERRIDE;
virtual bool Active() const OVERRIDE;
virtual base::TimeTicks LastTickTime() OVERRIDE;
virtual base::TimeTicks NextTickTime() OVERRIDE;
// VSyncClient implementation
virtual void DidVSync(base::TimeTicks frame_time) OVERRIDE;
protected:
explicit VSyncTimeSource(VSyncProvider* vsync_provider,
NotificationDisableOption option);
virtual ~VSyncTimeSource();
base::TimeTicks last_tick_time_;
base::TimeDelta interval_;
bool active_;
bool notification_requested_;
VSyncProvider* vsync_provider_;
TimeSourceClient* client_;
NotificationDisableOption disable_option_;
DISALLOW_COPY_AND_ASSIGN(VSyncTimeSource);
};
} // namespace cc
#endif // CC_SCHEDULER_VSYNC_TIME_SOURCE_H_
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