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// Copyright 2011 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_FRAME_RATE_CONTROLLER_H_
#define CC_SCHEDULER_FRAME_RATE_CONTROLLER_H_
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/time/time.h"
#include "cc/base/cc_export.h"
#include "cc/output/begin_frame_args.h"
namespace base { class SingleThreadTaskRunner; }
namespace cc {
class TimeSource;
class FrameRateController;
class CC_EXPORT FrameRateControllerClient {
protected:
virtual ~FrameRateControllerClient() {}
public:
// Throttled is true when we have a maximum number of frames pending.
virtual void FrameRateControllerTick(bool throttled,
const BeginFrameArgs& args) = 0;
};
class FrameRateControllerTimeSourceAdapter;
// The FrameRateController is used in cases where we self-tick (i.e. BeginFrame
// is not sent by a parent compositor.
class CC_EXPORT FrameRateController {
public:
explicit FrameRateController(scoped_refptr<TimeSource> timer);
// Alternate form of FrameRateController with unthrottled frame-rate.
explicit FrameRateController(base::SingleThreadTaskRunner* task_runner);
virtual ~FrameRateController();
void SetClient(FrameRateControllerClient* client) { client_ = client; }
// Returns a valid BeginFrame on activation to potentially be used
// retroactively.
BeginFrameArgs SetActive(bool active);
bool IsActive() { return active_; }
// Use the following methods to adjust target frame rate.
//
// Multiple frames can be in-progress, but for every DidSwapBuffers, a
// DidFinishFrame should be posted.
//
// If the rendering pipeline crashes, call DidAbortAllPendingFrames.
void DidSwapBuffers();
void DidSwapBuffersComplete();
void DidAbortAllPendingFrames();
void SetMaxSwapsPending(int max_swaps_pending); // 0 for unlimited.
int MaxSwapsPending() const { return max_swaps_pending_; }
int NumSwapsPendingForTesting() const { return num_frames_pending_; }
// This returns null for unthrottled frame-rate.
base::TimeTicks NextTickTime();
// This returns now for unthrottled frame-rate.
base::TimeTicks LastTickTime();
void SetTimebaseAndInterval(base::TimeTicks timebase,
base::TimeDelta interval);
void SetDeadlineAdjustment(base::TimeDelta delta);
protected:
friend class FrameRateControllerTimeSourceAdapter;
void OnTimerTick();
void PostManualTick();
void ManualTick();
FrameRateControllerClient* client_;
int num_frames_pending_;
int max_swaps_pending_;
base::TimeDelta interval_;
base::TimeDelta deadline_adjustment_;
scoped_refptr<TimeSource> time_source_;
scoped_ptr<FrameRateControllerTimeSourceAdapter> time_source_client_adapter_;
bool active_;
// Members for unthrottled frame-rate.
bool is_time_source_throttling_;
base::WeakPtrFactory<FrameRateController> weak_factory_;
base::SingleThreadTaskRunner* task_runner_;
private:
DISALLOW_COPY_AND_ASSIGN(FrameRateController);
};
} // namespace cc
#endif // CC_SCHEDULER_FRAME_RATE_CONTROLLER_H_
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