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/*
* Copyright (C) 2013 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_ANIMATION_ANIMATION_CLOCK_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_ANIMATION_ANIMATION_CLOCK_H_
#include <limits>
#include "base/macros.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/platform/wtf/allocator.h"
#include "third_party/blink/renderer/platform/wtf/time.h"
namespace blink {
// Maintains a stationary clock time during script execution. Tries to track
// the glass time (the moment photons leave the screen) of the current animation
// frame.
class CORE_EXPORT AnimationClock {
DISALLOW_NEW();
public:
using TimeTicksFunction = base::TimeTicks (*)();
explicit AnimationClock(
TimeTicksFunction monotonically_increasing_time = WTF::CurrentTimeTicks)
: monotonically_increasing_time_(monotonically_increasing_time),
time_(),
task_for_which_time_was_calculated_(
std::numeric_limits<unsigned>::max()) {}
void UpdateTime(base::TimeTicks time);
double CurrentTime();
void ResetTimeForTesting(base::TimeTicks time = base::TimeTicks());
void DisableSyntheticTimeForTesting() {
monotonically_increasing_time_ = nullptr;
}
// notifyTaskStart should be called right before the main message loop starts
// to run the next task from the message queue.
static void NotifyTaskStart() { ++currently_running_task_; }
private:
TimeTicksFunction monotonically_increasing_time_;
base::TimeTicks time_;
unsigned task_for_which_time_was_calculated_;
static unsigned currently_running_task_;
DISALLOW_COPY_AND_ASSIGN(AnimationClock);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_ANIMATION_ANIMATION_CLOCK_H_
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