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.utils; 18 19 import static android.view.DisplayCutout.BOUNDS_POSITION_LENGTH; 20 import static android.view.Surface.ROTATION_0; 21 import static android.view.Surface.ROTATION_180; 22 import static android.view.Surface.ROTATION_270; 23 import static android.view.Surface.ROTATION_90; 24 25 import static com.android.server.wm.utils.CoordinateTransforms.transformPhysicalToLogicalCoordinates; 26 27 import android.graphics.Matrix; 28 import android.graphics.Rect; 29 import android.graphics.RectF; 30 31 import com.android.internal.annotations.VisibleForTesting; 32 33 /** 34 * Utility to compute bounds after rotating the screen. 35 */ 36 public class DisplayRotationUtil { 37 private final Matrix mTmpMatrix = new Matrix(); 38 getRotationToBoundsOffset(int rotation)39 private static int getRotationToBoundsOffset(int rotation) { 40 switch (rotation) { 41 case ROTATION_0: 42 return 0; 43 case ROTATION_90: 44 return -1; 45 case ROTATION_180: 46 return 2; 47 case ROTATION_270: 48 return 1; 49 default: 50 // should not happen 51 return 0; 52 } 53 } 54 55 @VisibleForTesting getBoundIndexFromRotation(int i, int rotation)56 static int getBoundIndexFromRotation(int i, int rotation) { 57 return Math.floorMod(i + getRotationToBoundsOffset(rotation), 58 BOUNDS_POSITION_LENGTH); 59 } 60 61 /** 62 * Compute bounds after rotating teh screen. 63 * 64 * @param bounds Bounds before the rotation. The array must contain exactly 4 non-null elements. 65 * @param rotation rotation constant defined in android.view.Surface. 66 * @param initialDisplayWidth width of the display before the rotation. 67 * @param initialDisplayHeight height of the display before the rotation. 68 * @return Bounds after the rotation. 69 * 70 * @hide 71 */ getRotatedBounds( Rect[] bounds, int rotation, int initialDisplayWidth, int initialDisplayHeight)72 public Rect[] getRotatedBounds( 73 Rect[] bounds, int rotation, int initialDisplayWidth, int initialDisplayHeight) { 74 if (bounds.length != BOUNDS_POSITION_LENGTH) { 75 throw new IllegalArgumentException( 76 "bounds must have exactly 4 elements: bounds=" + bounds); 77 } 78 if (rotation == ROTATION_0) { 79 return bounds; 80 } 81 transformPhysicalToLogicalCoordinates(rotation, initialDisplayWidth, initialDisplayHeight, 82 mTmpMatrix); 83 Rect[] newBounds = new Rect[BOUNDS_POSITION_LENGTH]; 84 for (int i = 0; i < bounds.length; i++) { 85 86 final Rect rect = bounds[i]; 87 if (!rect.isEmpty()) { 88 final RectF rectF = new RectF(rect); 89 mTmpMatrix.mapRect(rectF); 90 rectF.round(rect); 91 } 92 newBounds[getBoundIndexFromRotation(i, rotation)] = rect; 93 } 94 return newBounds; 95 } 96 } 97