1 /* 2 * Copyright (C) 2021 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.util; 18 19 import android.content.res.Resources; 20 import android.view.Display; 21 22 import com.android.internal.R; 23 24 /** 25 * Utils for loading display related resources and calculations. 26 * 27 * @hide 28 */ 29 public class DisplayUtils { 30 31 /** 32 * Gets the index of the given display unique id in {@link R.array#config_displayUniqueIdArray} 33 * which is used to get the related cutout configs for that display. 34 * 35 * For multi-display device, {@link R.array#config_displayUniqueIdArray} should be set for each 36 * display if there are different type of cutouts on each display. 37 * For single display device, {@link R.array#config_displayUniqueIdArray} should not to be set 38 * and the system will load the default configs for main built-in display. 39 */ getDisplayUniqueIdConfigIndex(Resources res, String displayUniqueId)40 public static int getDisplayUniqueIdConfigIndex(Resources res, String displayUniqueId) { 41 int index = -1; 42 if (displayUniqueId == null || displayUniqueId.isEmpty()) { 43 return index; 44 } 45 final String[] ids = res.getStringArray(R.array.config_displayUniqueIdArray); 46 final int size = ids.length; 47 for (int i = 0; i < size; i++) { 48 if (displayUniqueId.equals(ids[i])) { 49 index = i; 50 break; 51 } 52 } 53 return index; 54 } 55 56 /** 57 * Returns the Display.Mode with maximum resolution. 58 */ getMaximumResolutionDisplayMode(Display.Mode[] modes)59 public static Display.Mode getMaximumResolutionDisplayMode(Display.Mode[] modes) { 60 if (modes == null || modes.length == 0) { 61 return null; 62 } 63 int maxWidth = 0; 64 Display.Mode target = null; 65 for (Display.Mode mode : modes) { 66 if (mode.getPhysicalWidth() > maxWidth) { 67 maxWidth = mode.getPhysicalWidth(); 68 target = mode; 69 } 70 } 71 return target; 72 } 73 74 /** 75 * Get the display size ratio based on the physical display size. 76 */ getPhysicalPixelDisplaySizeRatio( int physicalWidth, int physicalHeight, int currentWidth, int currentHeight)77 public static float getPhysicalPixelDisplaySizeRatio( 78 int physicalWidth, int physicalHeight, int currentWidth, int currentHeight) { 79 if (physicalWidth == currentWidth && physicalHeight == currentHeight) { 80 return 1f; 81 } 82 final float widthRatio = (float) currentWidth / physicalWidth; 83 final float heightRatio = (float) currentHeight / physicalHeight; 84 return Math.min(widthRatio, heightRatio); 85 } 86 } 87