Svetoslav | 1376d60 | 2014-03-13 11:17:26 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2014 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package android.view; |
| 18 | |
| 19 | import android.os.Parcel; |
| 20 | import android.os.Parcelable; |
| 21 | |
| 22 | /** |
| 23 | * This class contains window content frame statistics. For example, a window content |
| 24 | * is rendred in frames when a view is scrolled. The frame statistics are a snapshot |
| 25 | * for the time interval from {@link #getStartTimeNano()} to {@link #getEndTimeNano()}. |
| 26 | * <p> |
| 27 | * The key idea is that in order to provide a smooth user experience an application |
| 28 | * has to draw a frame at a specific time interval obtained by calling {@link |
| 29 | * #getRefreshPeriodNano()}. If the application does not render a frame every refresh |
| 30 | * period the user will see irregular UI transitions. |
| 31 | * </p> |
| 32 | * <p> |
| 33 | * An application posts a frame for presentation by synchronously rendering its contents |
| 34 | * in a buffer which is then posted or posting a buffer to which the application is |
| 35 | * asychronously rendering the content via GL. After the frame is posted and rendered |
| 36 | * (potentially asynchronosly) it is presented to the user. The time a frame was posted |
| 37 | * can be obtained via {@link #getFramePostedTimeNano(int)}, the time a frame content |
| 38 | * was rendered and ready for dsiplay (GL case) via {@link #getFrameReadyTimeNano(int)}, |
| 39 | * and the time a frame was presented on the screen via {@link #getFramePresentedTimeNano(int)}. |
| 40 | * </p> |
| 41 | */ |
| 42 | public final class WindowContentFrameStats extends FrameStats implements Parcelable { |
| 43 | private long[] mFramesPostedTimeNano; |
| 44 | private long[] mFramesReadyTimeNano; |
| 45 | |
| 46 | /** |
| 47 | * @hide |
| 48 | */ |
| 49 | public WindowContentFrameStats() { |
| 50 | /* do nothing */ |
| 51 | } |
| 52 | |
| 53 | /** |
| 54 | * Initializes this isntance. |
| 55 | * |
| 56 | * @param refreshPeriodNano The display refresh period. |
| 57 | * @param framesPostedTimeNano The times in milliseconds for when the frame contents were posted. |
| 58 | * @param framesPresentedTimeNano The times in milliseconds for when the frame contents were presented. |
| 59 | * @param framesReadyTimeNano The times in milliseconds for when the frame contents were ready to be presented. |
| 60 | * |
| 61 | * @hide |
| 62 | */ |
| 63 | public void init(long refreshPeriodNano, long[] framesPostedTimeNano, |
| 64 | long[] framesPresentedTimeNano, long[] framesReadyTimeNano) { |
| 65 | mRefreshPeriodNano = refreshPeriodNano; |
| 66 | mFramesPostedTimeNano = framesPostedTimeNano; |
| 67 | mFramesPresentedTimeNano = framesPresentedTimeNano; |
| 68 | mFramesReadyTimeNano = framesReadyTimeNano; |
| 69 | } |
| 70 | |
| 71 | private WindowContentFrameStats(Parcel parcel) { |
| 72 | mRefreshPeriodNano = parcel.readLong(); |
| 73 | mFramesPostedTimeNano = parcel.createLongArray(); |
| 74 | mFramesPresentedTimeNano = parcel.createLongArray(); |
| 75 | mFramesReadyTimeNano = parcel.createLongArray(); |
| 76 | } |
| 77 | |
| 78 | /** |
| 79 | * Get the time a frame at a given index was posted by the producer (e.g. the application). |
| 80 | * It is either explicitly set or defaulted to the time when the render buffer was posted. |
| 81 | * <p> |
| 82 | * <strong>Note:</strong> A frame can be posted and still it contents being rendered |
| 83 | * asynchronously in GL. To get the time the frame content was completely rendered and |
| 84 | * ready to display call {@link #getFrameReadyTimeNano(int)}. |
| 85 | * </p> |
| 86 | * |
| 87 | * @param index The frame index. |
| 88 | * @return The posted time in nanoseconds. |
| 89 | */ |
| 90 | public long getFramePostedTimeNano(int index) { |
| 91 | if (mFramesPostedTimeNano == null) { |
| 92 | throw new IndexOutOfBoundsException(); |
| 93 | } |
| 94 | return mFramesPostedTimeNano[index]; |
| 95 | } |
| 96 | |
| 97 | /** |
| 98 | * Get the time a frame at a given index was ready for presentation. |
| 99 | * <p> |
| 100 | * <strong>Note:</strong> A frame can be posted and still it contents being rendered |
| 101 | * asynchronously in GL. In such a case this is the time when the frame contents were |
| 102 | * completely rendered. |
| 103 | * </p> |
| 104 | * |
| 105 | * @param index The frame index. |
| 106 | * @return The ready time in nanoseconds or {@link #UNDEFINED_TIME_NANO} |
| 107 | * if the frame is not ready yet. |
| 108 | */ |
| 109 | public long getFrameReadyTimeNano(int index) { |
| 110 | if (mFramesReadyTimeNano == null) { |
| 111 | throw new IndexOutOfBoundsException(); |
| 112 | } |
| 113 | return mFramesReadyTimeNano[index]; |
| 114 | } |
| 115 | |
| 116 | @Override |
| 117 | public int describeContents() { |
| 118 | return 0; |
| 119 | } |
| 120 | |
| 121 | @Override |
| 122 | public void writeToParcel(Parcel parcel, int flags) { |
| 123 | parcel.writeLong(mRefreshPeriodNano); |
| 124 | parcel.writeLongArray(mFramesPostedTimeNano); |
| 125 | parcel.writeLongArray(mFramesPresentedTimeNano); |
| 126 | parcel.writeLongArray(mFramesReadyTimeNano); |
| 127 | } |
| 128 | |
| 129 | @Override |
| 130 | public String toString() { |
| 131 | StringBuilder builder = new StringBuilder(); |
| 132 | builder.append("WindowContentFrameStats["); |
| 133 | builder.append("frameCount:" + getFrameCount()); |
| 134 | builder.append(", fromTimeNano:" + getStartTimeNano()); |
| 135 | builder.append(", toTimeNano:" + getEndTimeNano()); |
| 136 | builder.append(']'); |
| 137 | return builder.toString(); |
| 138 | } |
| 139 | |
| 140 | public static final Parcelable.Creator<WindowContentFrameStats> CREATOR = |
| 141 | new Creator<WindowContentFrameStats>() { |
| 142 | @Override |
| 143 | public WindowContentFrameStats createFromParcel(Parcel parcel) { |
| 144 | return new WindowContentFrameStats(parcel); |
| 145 | } |
| 146 | |
| 147 | @Override |
| 148 | public WindowContentFrameStats[] newArray(int size) { |
| 149 | return new WindowContentFrameStats[size]; |
| 150 | } |
| 151 | }; |
| 152 | } |