1 /* 2 * Copyright (C) 2018 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 com.android.server.wm; 18 19 import static android.view.Surface.ROTATION_270; 20 import static android.view.Surface.ROTATION_90; 21 22 import android.graphics.Matrix; 23 import android.os.IBinder; 24 import android.view.DisplayInfo; 25 import android.view.Surface.Rotation; 26 import android.view.SurfaceControl; 27 import android.view.SurfaceControl.Transaction; 28 29 import com.android.server.wm.utils.CoordinateTransforms; 30 31 import java.io.PrintWriter; 32 import java.io.StringWriter; 33 34 /** 35 * Helper class for seamless rotation. 36 * 37 * Works by transforming the {@link WindowState} back into the old display rotation. 38 * 39 * Uses {@link Transaction#deferTransactionUntil(SurfaceControl, IBinder, long)} instead of 40 * latching on the buffer size to allow for seamless 180 degree rotations. 41 */ 42 public class SeamlessRotator { 43 44 private final Matrix mTransform = new Matrix(); 45 private final float[] mFloat9 = new float[9]; 46 private final int mOldRotation; 47 private final int mNewRotation; 48 /* If the seamless rotator is used to rotate part of the hierarchy, then provide a transform 49 * hint based on the display orientation if the entire display was rotated. When the display 50 * orientation matches the hierarchy orientation, the fixed transform hint will be removed. 51 * This will prevent allocating different buffer sizes by the graphic producers when the 52 * orientation of a layer changes. 53 */ 54 private final boolean mApplyFixedTransformHint; 55 private final int mFixedTransformHint; 56 57 SeamlessRotator(@otation int oldRotation, @Rotation int newRotation, DisplayInfo info, boolean applyFixedTransformationHint)58 public SeamlessRotator(@Rotation int oldRotation, @Rotation int newRotation, DisplayInfo info, 59 boolean applyFixedTransformationHint) { 60 mOldRotation = oldRotation; 61 mNewRotation = newRotation; 62 mApplyFixedTransformHint = applyFixedTransformationHint; 63 mFixedTransformHint = oldRotation; 64 final boolean flipped = info.rotation == ROTATION_90 || info.rotation == ROTATION_270; 65 final int pH = flipped ? info.logicalWidth : info.logicalHeight; 66 final int pW = flipped ? info.logicalHeight : info.logicalWidth; 67 // Initialize transform matrix by physical size. 68 final Matrix tmp = new Matrix(); 69 CoordinateTransforms.transformLogicalToPhysicalCoordinates(oldRotation, pW, pH, mTransform); 70 CoordinateTransforms.transformPhysicalToLogicalCoordinates(newRotation, pW, pH, tmp); 71 mTransform.postConcat(tmp); 72 } 73 74 /** 75 * Applies a transform to the {@link WindowContainer} surface that undoes the effect of the 76 * global display rotation. 77 */ unrotate(Transaction transaction, WindowContainer win)78 public void unrotate(Transaction transaction, WindowContainer win) { 79 transaction.setMatrix(win.getSurfaceControl(), mTransform, mFloat9); 80 // WindowState sets the position of the window so transform the position and update it. 81 final float[] winSurfacePos = {win.mLastSurfacePosition.x, win.mLastSurfacePosition.y}; 82 mTransform.mapPoints(winSurfacePos); 83 transaction.setPosition(win.getSurfaceControl(), winSurfacePos[0], winSurfacePos[1]); 84 if (mApplyFixedTransformHint) { 85 transaction.setFixedTransformHint(win.mSurfaceControl, mFixedTransformHint); 86 } 87 } 88 89 /** 90 * Returns the rotation of the display before it started rotating. 91 * 92 * @return the old rotation of the display 93 */ 94 @Rotation getOldRotation()95 public int getOldRotation() { 96 return mOldRotation; 97 } 98 99 /** 100 * Removes the transform and sets the previously known surface position for {@link WindowState} 101 * surface that undoes the effect of the global display rotation. 102 * 103 * Removing the transform and the result of the {@link WindowState} layout are both tied to the 104 * {@link WindowState} next frame, such that they apply at the same time the client draws the 105 * window in the new orientation. 106 * 107 * In the case of a rotation timeout, we want to remove the transform immediately and not defer 108 * it. 109 */ finish(WindowState win, boolean timeout)110 public void finish(WindowState win, boolean timeout) { 111 final Transaction t = win.getPendingTransaction(); 112 finish(t, win); 113 if (win.mWinAnimator.mSurfaceController != null && !timeout) { 114 t.deferTransactionUntil(win.mSurfaceControl, 115 win.getClientViewRootSurface(), win.getFrameNumber()); 116 t.deferTransactionUntil(win.mWinAnimator.mSurfaceController.mSurfaceControl, 117 win.getClientViewRootSurface(), win.getFrameNumber()); 118 } 119 } 120 121 /** Removes the transform and restore to the original last position. */ finish(Transaction t, WindowContainer win)122 void finish(Transaction t, WindowContainer win) { 123 mTransform.reset(); 124 t.setMatrix(win.mSurfaceControl, mTransform, mFloat9); 125 t.setPosition(win.mSurfaceControl, win.mLastSurfacePosition.x, win.mLastSurfacePosition.y); 126 if (mApplyFixedTransformHint) { 127 t.unsetFixedTransformHint(win.mSurfaceControl); 128 } 129 } 130 dump(PrintWriter pw)131 public void dump(PrintWriter pw) { 132 pw.print("{old="); pw.print(mOldRotation); pw.print(", new="); pw.print(mNewRotation); 133 pw.print("}"); 134 } 135 136 @Override toString()137 public String toString() { 138 StringWriter sw = new StringWriter(); 139 dump(new PrintWriter(sw)); 140 return "ForcedSeamlessRotator" + sw.toString(); 141 } 142 } 143