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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.view;
/**
* This is the base class for frame statistics.
*/
public abstract class FrameStats {
/**
* Undefined time.
*/
public static final long UNDEFINED_TIME_NANO = -1;
/** @hide */
protected long mRefreshPeriodNano;
/** @hide */
protected long[] mFramesPresentedTimeNano;
/**
* Gets the refresh period of the display hosting the window(s) for
* which these statistics apply.
*
* @return The refresh period in nanoseconds.
*/
public final long getRefreshPeriodNano() {
return mRefreshPeriodNano;
}
/**
* Gets the number of frames for which there is data.
*
* @return The number of frames.
*/
public final int getFrameCount() {
return mFramesPresentedTimeNano != null
? mFramesPresentedTimeNano.length : 0;
}
/**
* Gets the start time of the interval for which these statistics
* apply. The start interval is the time when the first frame was
* presented.
*
* @return The start time in nanoseconds or {@link #UNDEFINED_TIME_NANO}
* if there is no frame data.
*/
public final long getStartTimeNano() {
if (getFrameCount() <= 0) {
return UNDEFINED_TIME_NANO;
}
return mFramesPresentedTimeNano[0];
}
/**
* Gets the end time of the interval for which these statistics
* apply. The end interval is the time when the last frame was
* presented.
*
* @return The end time in nanoseconds or {@link #UNDEFINED_TIME_NANO}
* if there is no frame data.
*/
public final long getEndTimeNano() {
if (getFrameCount() <= 0) {
return UNDEFINED_TIME_NANO;
}
return mFramesPresentedTimeNano[mFramesPresentedTimeNano.length - 1];
}
/**
* Get the time a frame at a given index was presented.
*
* @param index The frame index.
* @return The presented time in nanoseconds or {@link #UNDEFINED_TIME_NANO}
* if the frame is not presented yet.
*/
public final long getFramePresentedTimeNano(int index) {
if (mFramesPresentedTimeNano == null) {
throw new IndexOutOfBoundsException();
}
return mFramesPresentedTimeNano[index];
}
}
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