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/*
* Copyright (c) 2014, 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.
*/
#include "third_party/blink/renderer/core/animation/animation_clock.h"
#include <math.h>
#include "third_party/blink/renderer/platform/wtf/time.h"
namespace {
// FIXME: This is an approximation of time between frames, used when
// ticking the animation clock outside of animation frame callbacks.
// Ideally this would be generated by the compositor.
constexpr base::TimeDelta kApproximateFrameTime =
base::TimeDelta::FromSecondsD(1 / 60.0);
}
namespace blink {
unsigned AnimationClock::currently_running_task_ = 0;
void AnimationClock::UpdateTime(base::TimeTicks time) {
if (time > time_)
time_ = time;
task_for_which_time_was_calculated_ = currently_running_task_;
}
double AnimationClock::CurrentTime() {
if (monotonically_increasing_time_ &&
task_for_which_time_was_calculated_ != currently_running_task_) {
const base::TimeTicks current_time = monotonically_increasing_time_();
if (time_ < current_time) {
// Advance to the first estimated frame after the current time.
const base::TimeDelta frame_shift =
(current_time - time_) % kApproximateFrameTime;
const base::TimeTicks new_time =
current_time + kApproximateFrameTime - frame_shift;
DCHECK_GE(new_time, current_time);
DCHECK_LE(new_time, current_time + kApproximateFrameTime);
UpdateTime(new_time);
} else {
task_for_which_time_was_calculated_ = currently_running_task_;
}
}
return time_.since_origin().InSecondsF();
}
void AnimationClock::ResetTimeForTesting(base::TimeTicks time) {
time_ = time;
task_for_which_time_was_calculated_ = 0;
currently_running_task_ = 0;
}
} // namespace blink
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