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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;
import android.os.Parcel;
import android.os.Parcelable;
/**
* This class contains window content frame statistics. For example, a window content
* is rendred in frames when a view is scrolled. The frame statistics are a snapshot
* for the time interval from {@link #getStartTimeNano()} to {@link #getEndTimeNano()}.
* <p>
* The key idea is that in order to provide a smooth user experience an application
* has to draw a frame at a specific time interval obtained by calling {@link
* #getRefreshPeriodNano()}. If the application does not render a frame every refresh
* period the user will see irregular UI transitions.
* </p>
* <p>
* An application posts a frame for presentation by synchronously rendering its contents
* in a buffer which is then posted or posting a buffer to which the application is
* asychronously rendering the content via GL. After the frame is posted and rendered
* (potentially asynchronosly) it is presented to the user. The time a frame was posted
* can be obtained via {@link #getFramePostedTimeNano(int)}, the time a frame content
* was rendered and ready for dsiplay (GL case) via {@link #getFrameReadyTimeNano(int)},
* and the time a frame was presented on the screen via {@link #getFramePresentedTimeNano(int)}.
* </p>
*/
public final class WindowContentFrameStats extends FrameStats implements Parcelable {
private long[] mFramesPostedTimeNano;
private long[] mFramesReadyTimeNano;
/**
* @hide
*/
public WindowContentFrameStats() {
/* do nothing */
}
/**
* Initializes this isntance.
*
* @param refreshPeriodNano The display refresh period.
* @param framesPostedTimeNano The times in milliseconds for when the frame contents were posted.
* @param framesPresentedTimeNano The times in milliseconds for when the frame contents were presented.
* @param framesReadyTimeNano The times in milliseconds for when the frame contents were ready to be presented.
*
* @hide
*/
public void init(long refreshPeriodNano, long[] framesPostedTimeNano,
long[] framesPresentedTimeNano, long[] framesReadyTimeNano) {
mRefreshPeriodNano = refreshPeriodNano;
mFramesPostedTimeNano = framesPostedTimeNano;
mFramesPresentedTimeNano = framesPresentedTimeNano;
mFramesReadyTimeNano = framesReadyTimeNano;
}
private WindowContentFrameStats(Parcel parcel) {
mRefreshPeriodNano = parcel.readLong();
mFramesPostedTimeNano = parcel.createLongArray();
mFramesPresentedTimeNano = parcel.createLongArray();
mFramesReadyTimeNano = parcel.createLongArray();
}
/**
* Get the time a frame at a given index was posted by the producer (e.g. the application).
* It is either explicitly set or defaulted to the time when the render buffer was posted.
* <p>
* <strong>Note:</strong> A frame can be posted and still it contents being rendered
* asynchronously in GL. To get the time the frame content was completely rendered and
* ready to display call {@link #getFrameReadyTimeNano(int)}.
* </p>
*
* @param index The frame index.
* @return The posted time in nanoseconds.
*/
public long getFramePostedTimeNano(int index) {
if (mFramesPostedTimeNano == null) {
throw new IndexOutOfBoundsException();
}
return mFramesPostedTimeNano[index];
}
/**
* Get the time a frame at a given index was ready for presentation.
* <p>
* <strong>Note:</strong> A frame can be posted and still it contents being rendered
* asynchronously in GL. In such a case this is the time when the frame contents were
* completely rendered.
* </p>
*
* @param index The frame index.
* @return The ready time in nanoseconds or {@link #UNDEFINED_TIME_NANO}
* if the frame is not ready yet.
*/
public long getFrameReadyTimeNano(int index) {
if (mFramesReadyTimeNano == null) {
throw new IndexOutOfBoundsException();
}
return mFramesReadyTimeNano[index];
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel parcel, int flags) {
parcel.writeLong(mRefreshPeriodNano);
parcel.writeLongArray(mFramesPostedTimeNano);
parcel.writeLongArray(mFramesPresentedTimeNano);
parcel.writeLongArray(mFramesReadyTimeNano);
}
@Override
public String toString() {
StringBuilder builder = new StringBuilder();
builder.append("WindowContentFrameStats[");
builder.append("frameCount:" + getFrameCount());
builder.append(", fromTimeNano:" + getStartTimeNano());
builder.append(", toTimeNano:" + getEndTimeNano());
builder.append(']');
return builder.toString();
}
public static final Parcelable.Creator<WindowContentFrameStats> CREATOR =
new Creator<WindowContentFrameStats>() {
@Override
public WindowContentFrameStats createFromParcel(Parcel parcel) {
return new WindowContentFrameStats(parcel);
}
@Override
public WindowContentFrameStats[] newArray(int size) {
return new WindowContentFrameStats[size];
}
};
}
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