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/*
* Copyright (C) 2021 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.util;
import android.content.Context;
import android.content.res.Resources;
import android.view.Display;
import android.view.DisplayInfo;
import com.android.internal.R;
/**
* Utils for loading display related resources and calculations.
*
* @hide
*/
public class DisplayUtils {
/**
* Gets the index of the given display unique id in {@link R.array#config_displayUniqueIdArray}
* which is used to get the related cutout configs for that display.
*
* For multi-display device, {@link R.array#config_displayUniqueIdArray} should be set for each
* display if there are different type of cutouts on each display.
* For single display device, {@link R.array#config_displayUniqueIdArray} should not to be set
* and the system will load the default configs for main built-in display.
*/
public static int getDisplayUniqueIdConfigIndex(Resources res, String displayUniqueId) {
int index = -1;
if (displayUniqueId == null || displayUniqueId.isEmpty()) {
return index;
}
final String[] ids = res.getStringArray(R.array.config_displayUniqueIdArray);
final int size = ids.length;
for (int i = 0; i < size; i++) {
if (displayUniqueId.equals(ids[i])) {
index = i;
break;
}
}
return index;
}
/**
* Returns the Display.Mode with maximum resolution.
*/
public static Display.Mode getMaximumResolutionDisplayMode(Display.Mode[] modes) {
if (modes == null || modes.length == 0) {
return null;
}
int maxWidth = 0;
Display.Mode target = null;
for (Display.Mode mode : modes) {
if (mode.getPhysicalWidth() > maxWidth) {
maxWidth = mode.getPhysicalWidth();
target = mode;
}
}
return target;
}
/**
* Get the display size ratio based on the physical display size.
*/
public static float getPhysicalPixelDisplaySizeRatio(
int physicalWidth, int physicalHeight, int currentWidth, int currentHeight) {
if (physicalWidth == currentWidth && physicalHeight == currentHeight) {
return 1f;
}
final float widthRatio = (float) currentWidth / physicalWidth;
final float heightRatio = (float) currentHeight / physicalHeight;
return Math.min(widthRatio, heightRatio);
}
/**
* Get the display size ratio for the current resolution vs the maximum supported
* resolution.
*/
public static float getScaleFactor(Context context) {
DisplayInfo displayInfo = new DisplayInfo();
context.getDisplay().getDisplayInfo(displayInfo);
final Display.Mode maxDisplayMode =
getMaximumResolutionDisplayMode(displayInfo.supportedModes);
final float scaleFactor = getPhysicalPixelDisplaySizeRatio(
maxDisplayMode.getPhysicalWidth(), maxDisplayMode.getPhysicalHeight(),
displayInfo.getNaturalWidth(), displayInfo.getNaturalHeight());
return scaleFactor;
}
}
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