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.Rotation; 25 import android.view.SurfaceControl; 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 public class SeamlessRotator { 39 40 private final Matrix mTransform = new Matrix(); 41 private final float[] mFloat9 = new float[9]; 42 private final int mOldRotation; 43 private final int mNewRotation; 44 /* If the seamless rotator is used to rotate part of the hierarchy, then provide a transform 45 * hint based on the display orientation if the entire display was rotated. When the display 46 * orientation matches the hierarchy orientation, the fixed transform hint will be removed. 47 * This will prevent allocating different buffer sizes by the graphic producers when the 48 * orientation of a layer changes. 49 */ 50 private final boolean mApplyFixedTransformHint; 51 private final int mFixedTransformHint; 52 53 SeamlessRotator(@otation int oldRotation, @Rotation int newRotation, DisplayInfo info, boolean applyFixedTransformationHint)54 public SeamlessRotator(@Rotation int oldRotation, @Rotation int newRotation, DisplayInfo info, 55 boolean applyFixedTransformationHint) { 56 mOldRotation = oldRotation; 57 mNewRotation = newRotation; 58 mApplyFixedTransformHint = applyFixedTransformationHint; 59 mFixedTransformHint = oldRotation; 60 final boolean flipped = info.rotation == ROTATION_90 || info.rotation == ROTATION_270; 61 final int pH = flipped ? info.logicalWidth : info.logicalHeight; 62 final int pW = flipped ? info.logicalHeight : info.logicalWidth; 63 // Initialize transform matrix by physical size. 64 final Matrix tmp = new Matrix(); 65 CoordinateTransforms.transformLogicalToPhysicalCoordinates(oldRotation, pW, pH, mTransform); 66 CoordinateTransforms.transformPhysicalToLogicalCoordinates(newRotation, pW, pH, tmp); 67 mTransform.postConcat(tmp); 68 } 69 70 /** 71 * Applies a transform to the {@link WindowContainer} surface that undoes the effect of the 72 * global display rotation. 73 */ unrotate(Transaction transaction, WindowContainer win)74 public void unrotate(Transaction transaction, WindowContainer win) { 75 applyTransform(transaction, win.getSurfaceControl()); 76 // WindowState sets the position of the window so transform the position and update it. 77 final float[] winSurfacePos = {win.mLastSurfacePosition.x, win.mLastSurfacePosition.y}; 78 mTransform.mapPoints(winSurfacePos); 79 transaction.setPosition(win.getSurfaceControl(), winSurfacePos[0], winSurfacePos[1]); 80 if (mApplyFixedTransformHint) { 81 transaction.setFixedTransformHint(win.mSurfaceControl, mFixedTransformHint); 82 } 83 } 84 applyTransform(Transaction t, SurfaceControl sc)85 void applyTransform(Transaction t, SurfaceControl sc) { 86 t.setMatrix(sc, mTransform, mFloat9); 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 */ finish(Transaction t, WindowContainer win)107 void finish(Transaction t, WindowContainer win) { 108 if (win.mSurfaceControl == null || !win.mSurfaceControl.isValid()) { 109 return; 110 } 111 112 setIdentityMatrix(t, win.mSurfaceControl); 113 t.setPosition(win.mSurfaceControl, win.mLastSurfacePosition.x, win.mLastSurfacePosition.y); 114 if (mApplyFixedTransformHint) { 115 t.unsetFixedTransformHint(win.mSurfaceControl); 116 } 117 } 118 setIdentityMatrix(Transaction t, SurfaceControl sc)119 void setIdentityMatrix(Transaction t, SurfaceControl sc) { 120 t.setMatrix(sc, Matrix.IDENTITY_MATRIX, mFloat9); 121 } 122 dump(PrintWriter pw)123 public void dump(PrintWriter pw) { 124 pw.print("{old="); pw.print(mOldRotation); pw.print(", new="); pw.print(mNewRotation); 125 pw.print("}"); 126 } 127 128 @Override toString()129 public String toString() { 130 StringWriter sw = new StringWriter(); 131 dump(new PrintWriter(sw)); 132 return "ForcedSeamlessRotator" + sw.toString(); 133 } 134 } 135