Alan Viverette | 8890cfa | 2016-03-25 14:56:38 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2015 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.settingslib.display; |
| 18 | |
| 19 | import com.android.settingslib.R; |
| 20 | |
| 21 | import android.content.Context; |
| 22 | import android.content.res.Resources; |
Alan Viverette | 11f831f | 2016-07-14 14:27:17 -0400 | [diff] [blame] | 23 | import android.hardware.display.DisplayManager; |
Alan Viverette | 8890cfa | 2016-03-25 14:56:38 -0400 | [diff] [blame] | 24 | import android.os.AsyncTask; |
| 25 | import android.os.RemoteException; |
Alan Viverette | df3a7ca | 2016-09-06 17:13:41 -0400 | [diff] [blame] | 26 | import android.os.UserHandle; |
Alan Viverette | 8890cfa | 2016-03-25 14:56:38 -0400 | [diff] [blame] | 27 | import android.util.DisplayMetrics; |
| 28 | import android.util.Log; |
| 29 | import android.util.MathUtils; |
| 30 | import android.view.Display; |
| 31 | import android.view.IWindowManager; |
| 32 | import android.view.WindowManagerGlobal; |
| 33 | |
| 34 | import java.util.Arrays; |
| 35 | |
| 36 | /** |
| 37 | * Utility methods for working with display density. |
| 38 | */ |
| 39 | public class DisplayDensityUtils { |
| 40 | private static final String LOG_TAG = "DisplayDensityUtils"; |
| 41 | |
| 42 | /** Minimum increment between density scales. */ |
| 43 | private static final float MIN_SCALE_INTERVAL = 0.09f; |
| 44 | |
| 45 | /** Minimum density scale. This is available on all devices. */ |
| 46 | private static final float MIN_SCALE = 0.85f; |
| 47 | |
| 48 | /** Maximum density scale. The actual scale used depends on the device. */ |
| 49 | private static final float MAX_SCALE = 1.50f; |
| 50 | |
| 51 | /** Summary used for "default" scale. */ |
| 52 | public static final int SUMMARY_DEFAULT = R.string.screen_zoom_summary_default; |
| 53 | |
| 54 | /** Summary used for "custom" scale. */ |
| 55 | private static final int SUMMARY_CUSTOM = R.string.screen_zoom_summary_custom; |
| 56 | |
| 57 | /** |
| 58 | * Summaries for scales smaller than "default" in order of smallest to |
| 59 | * largest. |
| 60 | */ |
| 61 | private static final int[] SUMMARIES_SMALLER = new int[] { |
| 62 | R.string.screen_zoom_summary_small |
| 63 | }; |
| 64 | |
| 65 | /** |
| 66 | * Summaries for scales larger than "default" in order of smallest to |
| 67 | * largest. |
| 68 | */ |
| 69 | private static final int[] SUMMARIES_LARGER = new int[] { |
| 70 | R.string.screen_zoom_summary_large, |
| 71 | R.string.screen_zoom_summary_very_large, |
| 72 | R.string.screen_zoom_summary_extremely_large, |
| 73 | }; |
| 74 | |
| 75 | /** |
| 76 | * Minimum allowed screen dimension, corresponds to resource qualifiers |
| 77 | * "small" or "sw320dp". This value must be at least the minimum screen |
| 78 | * size required by the CDD so that we meet developer expectations. |
| 79 | */ |
| 80 | private static final int MIN_DIMENSION_DP = 320; |
| 81 | |
| 82 | private final String[] mEntries; |
| 83 | private final int[] mValues; |
| 84 | |
| 85 | private final int mDefaultDensity; |
| 86 | private final int mCurrentIndex; |
| 87 | |
| 88 | public DisplayDensityUtils(Context context) { |
| 89 | final int defaultDensity = DisplayDensityUtils.getDefaultDisplayDensity( |
| 90 | Display.DEFAULT_DISPLAY); |
| 91 | if (defaultDensity <= 0) { |
| 92 | mEntries = null; |
| 93 | mValues = null; |
| 94 | mDefaultDensity = 0; |
| 95 | mCurrentIndex = -1; |
| 96 | return; |
| 97 | } |
| 98 | |
| 99 | final Resources res = context.getResources(); |
Alan Viverette | 11f831f | 2016-07-14 14:27:17 -0400 | [diff] [blame] | 100 | final DisplayMetrics metrics = new DisplayMetrics(); |
| 101 | context.getDisplay().getRealMetrics(metrics); |
| 102 | |
Alan Viverette | 8890cfa | 2016-03-25 14:56:38 -0400 | [diff] [blame] | 103 | final int currentDensity = metrics.densityDpi; |
| 104 | int currentDensityIndex = -1; |
| 105 | |
| 106 | // Compute number of "larger" and "smaller" scales for this display. |
| 107 | final int minDimensionPx = Math.min(metrics.widthPixels, metrics.heightPixels); |
| 108 | final int maxDensity = DisplayMetrics.DENSITY_MEDIUM * minDimensionPx / MIN_DIMENSION_DP; |
| 109 | final float maxScale = Math.min(MAX_SCALE, maxDensity / (float) defaultDensity); |
| 110 | final float minScale = MIN_SCALE; |
| 111 | final int numLarger = (int) MathUtils.constrain((maxScale - 1) / MIN_SCALE_INTERVAL, |
| 112 | 0, SUMMARIES_LARGER.length); |
| 113 | final int numSmaller = (int) MathUtils.constrain((1 - minScale) / MIN_SCALE_INTERVAL, |
| 114 | 0, SUMMARIES_SMALLER.length); |
| 115 | |
| 116 | String[] entries = new String[1 + numSmaller + numLarger]; |
| 117 | int[] values = new int[entries.length]; |
| 118 | int curIndex = 0; |
| 119 | |
| 120 | if (numSmaller > 0) { |
| 121 | final float interval = (1 - minScale) / numSmaller; |
| 122 | for (int i = numSmaller - 1; i >= 0; i--) { |
| 123 | // Round down to a multiple of 2 by truncating the low bit. |
| 124 | final int density = ((int) (defaultDensity * (1 - (i + 1) * interval))) & ~1; |
| 125 | if (currentDensity == density) { |
| 126 | currentDensityIndex = curIndex; |
| 127 | } |
| 128 | entries[curIndex] = res.getString(SUMMARIES_SMALLER[i]); |
| 129 | values[curIndex] = density; |
| 130 | curIndex++; |
| 131 | } |
| 132 | } |
| 133 | |
| 134 | if (currentDensity == defaultDensity) { |
| 135 | currentDensityIndex = curIndex; |
| 136 | } |
| 137 | values[curIndex] = defaultDensity; |
| 138 | entries[curIndex] = res.getString(SUMMARY_DEFAULT); |
| 139 | curIndex++; |
| 140 | |
| 141 | if (numLarger > 0) { |
| 142 | final float interval = (maxScale - 1) / numLarger; |
| 143 | for (int i = 0; i < numLarger; i++) { |
| 144 | // Round down to a multiple of 2 by truncating the low bit. |
| 145 | final int density = ((int) (defaultDensity * (1 + (i + 1) * interval))) & ~1; |
| 146 | if (currentDensity == density) { |
| 147 | currentDensityIndex = curIndex; |
| 148 | } |
| 149 | values[curIndex] = density; |
| 150 | entries[curIndex] = res.getString(SUMMARIES_LARGER[i]); |
| 151 | curIndex++; |
| 152 | } |
| 153 | } |
| 154 | |
| 155 | final int displayIndex; |
| 156 | if (currentDensityIndex >= 0) { |
| 157 | displayIndex = currentDensityIndex; |
| 158 | } else { |
| 159 | // We don't understand the current density. Must have been set by |
| 160 | // someone else. Make room for another entry... |
| 161 | int newLength = values.length + 1; |
| 162 | values = Arrays.copyOf(values, newLength); |
| 163 | values[curIndex] = currentDensity; |
| 164 | |
| 165 | entries = Arrays.copyOf(entries, newLength); |
| 166 | entries[curIndex] = res.getString(SUMMARY_CUSTOM, currentDensity); |
| 167 | |
| 168 | displayIndex = curIndex; |
| 169 | } |
| 170 | |
| 171 | mDefaultDensity = defaultDensity; |
| 172 | mCurrentIndex = displayIndex; |
| 173 | mEntries = entries; |
| 174 | mValues = values; |
| 175 | } |
| 176 | |
| 177 | public String[] getEntries() { |
| 178 | return mEntries; |
| 179 | } |
| 180 | |
| 181 | public int[] getValues() { |
| 182 | return mValues; |
| 183 | } |
| 184 | |
| 185 | public int getCurrentIndex() { |
| 186 | return mCurrentIndex; |
| 187 | } |
| 188 | |
| 189 | public int getDefaultDensity() { |
| 190 | return mDefaultDensity; |
| 191 | } |
| 192 | |
| 193 | /** |
| 194 | * Returns the default density for the specified display. |
| 195 | * |
| 196 | * @param displayId the identifier of the display |
| 197 | * @return the default density of the specified display, or {@code -1} if |
| 198 | * the display does not exist or the density could not be obtained |
| 199 | */ |
| 200 | private static int getDefaultDisplayDensity(int displayId) { |
| 201 | try { |
| 202 | final IWindowManager wm = WindowManagerGlobal.getWindowManagerService(); |
| 203 | return wm.getInitialDisplayDensity(displayId); |
| 204 | } catch (RemoteException exc) { |
| 205 | return -1; |
| 206 | } |
| 207 | } |
| 208 | |
| 209 | /** |
| 210 | * Asynchronously applies display density changes to the specified display. |
Alan Viverette | df3a7ca | 2016-09-06 17:13:41 -0400 | [diff] [blame] | 211 | * <p> |
| 212 | * The change will be applied to the user specified by the value of |
| 213 | * {@link UserHandle#myUserId()} at the time the method is called. |
Alan Viverette | 8890cfa | 2016-03-25 14:56:38 -0400 | [diff] [blame] | 214 | * |
| 215 | * @param displayId the identifier of the display to modify |
| 216 | */ |
| 217 | public static void clearForcedDisplayDensity(final int displayId) { |
Alan Viverette | df3a7ca | 2016-09-06 17:13:41 -0400 | [diff] [blame] | 218 | final int userId = UserHandle.myUserId(); |
| 219 | AsyncTask.execute(() -> { |
| 220 | try { |
| 221 | final IWindowManager wm = WindowManagerGlobal.getWindowManagerService(); |
| 222 | wm.clearForcedDisplayDensityForUser(displayId, userId); |
| 223 | } catch (RemoteException exc) { |
| 224 | Log.w(LOG_TAG, "Unable to clear forced display density setting"); |
Alan Viverette | 8890cfa | 2016-03-25 14:56:38 -0400 | [diff] [blame] | 225 | } |
| 226 | }); |
| 227 | } |
| 228 | |
| 229 | /** |
| 230 | * Asynchronously applies display density changes to the specified display. |
Alan Viverette | df3a7ca | 2016-09-06 17:13:41 -0400 | [diff] [blame] | 231 | * <p> |
| 232 | * The change will be applied to the user specified by the value of |
| 233 | * {@link UserHandle#myUserId()} at the time the method is called. |
Alan Viverette | 8890cfa | 2016-03-25 14:56:38 -0400 | [diff] [blame] | 234 | * |
| 235 | * @param displayId the identifier of the display to modify |
| 236 | * @param density the density to force for the specified display |
| 237 | */ |
| 238 | public static void setForcedDisplayDensity(final int displayId, final int density) { |
Alan Viverette | df3a7ca | 2016-09-06 17:13:41 -0400 | [diff] [blame] | 239 | final int userId = UserHandle.myUserId(); |
| 240 | AsyncTask.execute(() -> { |
| 241 | try { |
| 242 | final IWindowManager wm = WindowManagerGlobal.getWindowManagerService(); |
| 243 | wm.setForcedDisplayDensityForUser(displayId, density, userId); |
| 244 | } catch (RemoteException exc) { |
| 245 | Log.w(LOG_TAG, "Unable to save forced display density setting"); |
Alan Viverette | 8890cfa | 2016-03-25 14:56:38 -0400 | [diff] [blame] | 246 | } |
| 247 | }); |
| 248 | } |
| 249 | } |