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.view.DisplayInfo; 24 import android.view.Surface; 25 import android.view.Surface.Rotation; 26 import android.view.SurfaceControl.Transaction; 27 28 import com.android.server.wm.utils.CoordinateTransforms; 29 30 import java.io.PrintWriter; 31 import java.io.StringWriter; 32 33 /** 34 * Helper class for seamless rotation. 35 * 36 * Works by transforming the {@link WindowState} back into the old display rotation. 37 * 38 * Uses {@link android.view.SurfaceControl#deferTransactionUntil(Surface, long)} instead of 39 * latching on the buffer size to allow for seamless 180 degree rotations. 40 */ 41 public class SeamlessRotator { 42 43 private final Matrix mTransform = new Matrix(); 44 private final float[] mFloat9 = new float[9]; 45 private final int mOldRotation; 46 private final int mNewRotation; 47 SeamlessRotator(@otation int oldRotation, @Rotation int newRotation, DisplayInfo info)48 public SeamlessRotator(@Rotation int oldRotation, @Rotation int newRotation, DisplayInfo info) { 49 mOldRotation = oldRotation; 50 mNewRotation = newRotation; 51 52 final boolean flipped = info.rotation == ROTATION_90 || info.rotation == ROTATION_270; 53 final int h = flipped ? info.logicalWidth : info.logicalHeight; 54 final int w = flipped ? info.logicalHeight : info.logicalWidth; 55 56 final Matrix tmp = new Matrix(); 57 CoordinateTransforms.transformLogicalToPhysicalCoordinates(oldRotation, w, h, mTransform); 58 CoordinateTransforms.transformPhysicalToLogicalCoordinates(newRotation, w, h, tmp); 59 mTransform.postConcat(tmp); 60 } 61 62 /** 63 * Applies a transform to the {@link WindowState} surface that undoes the effect of the global 64 * display rotation. 65 */ unrotate(Transaction transaction, WindowState win)66 public void unrotate(Transaction transaction, WindowState win) { 67 transaction.setMatrix(win.getSurfaceControl(), mTransform, mFloat9); 68 69 // WindowState sets the position of the window so transform the position and update it. 70 final float[] winSurfacePos = {win.mLastSurfacePosition.x, win.mLastSurfacePosition.y}; 71 mTransform.mapPoints(winSurfacePos); 72 transaction.setPosition(win.getSurfaceControl(), winSurfacePos[0], winSurfacePos[1]); 73 } 74 75 /** 76 * Returns the rotation of the display before it started rotating. 77 * 78 * @return the old rotation of the display 79 */ 80 @Rotation getOldRotation()81 public int getOldRotation() { 82 return mOldRotation; 83 } 84 85 /** 86 * Removes the transform and sets the previously known surface position for {@link WindowState} 87 * surface that undoes the effect of the global display rotation. 88 * 89 * Removing the transform and the result of the {@link WindowState} layout are both tied to the 90 * {@link WindowState} next frame, such that they apply at the same time the client draws the 91 * window in the new orientation. 92 * 93 * In the case of a rotation timeout, we want to remove the transform immediately and not defer 94 * it. 95 */ finish(WindowState win, boolean timeout)96 public void finish(WindowState win, boolean timeout) { 97 mTransform.reset(); 98 final Transaction t = win.getPendingTransaction(); 99 t.setMatrix(win.mSurfaceControl, mTransform, mFloat9); 100 t.setPosition(win.mSurfaceControl, win.mLastSurfacePosition.x, win.mLastSurfacePosition.y); 101 if (win.mWinAnimator.mSurfaceController != null && !timeout) { 102 t.deferTransactionUntil(win.mSurfaceControl, 103 win.mWinAnimator.mSurfaceController.getHandle(), win.getFrameNumber()); 104 t.deferTransactionUntil(win.mWinAnimator.mSurfaceController.mSurfaceControl, 105 win.mWinAnimator.mSurfaceController.getHandle(), win.getFrameNumber()); 106 } 107 } 108 dump(PrintWriter pw)109 public void dump(PrintWriter pw) { 110 pw.print("{old="); pw.print(mOldRotation); pw.print(", new="); pw.print(mNewRotation); 111 pw.print("}"); 112 } 113 114 @Override toString()115 public String toString() { 116 StringWriter sw = new StringWriter(); 117 dump(new PrintWriter(sw)); 118 return "ForcedSeamlessRotator" + sw.toString(); 119 } 120 } 121