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This CL adds a simple scheduler for animation frames that holds a given interval in a given phase. The scheduler can be told the estimated duration of the BeginFrame callback and can adjust the callback to hit a given vsync interval. This CL also makes ganesh_app use this scheduler to animate. R=jamesr@chromium.org, ernstm@chromium.org Review URL: https://codereview.chromium.org/731893002
53 lines
1.2 KiB
C++
53 lines
1.2 KiB
C++
// Copyright 2014 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef SKY_SCHEDULER_TIMER_H_
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#define SKY_SCHEDULER_TIMER_H_
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#include "base/memory/weak_ptr.h"
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#include "base/single_thread_task_runner.h"
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#include "base/time/time.h"
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#include "sky/scheduler/time_interval.h"
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namespace sky {
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class Timer {
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public:
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class Client {
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public:
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virtual void OnTimerTick(base::TimeTicks now) = 0;
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protected:
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virtual ~Client();
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};
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Timer(Client* client,
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scoped_refptr<base::SingleThreadTaskRunner> task_runner);
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~Timer();
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void SetInterval(const TimeInterval& parameters);
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void SetEnabled(bool enabled);
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private:
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base::TimeTicks NextTickTarget(base::TimeTicks now);
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void ScheduleNextTick(base::TimeTicks now);
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void PostTickTask(base::TimeTicks now, base::TimeTicks target);
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void OnTimerFired();
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Client* client_;
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scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
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TimeInterval interval_;
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base::TimeTicks last_tick_;
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base::TimeTicks current_target_;
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bool enabled_;
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base::WeakPtrFactory<Timer> weak_factory_;
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};
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}
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#endif // SKY_SCHEDULER_TIMER_H_
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