/*
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* Copyright (C) 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.server.wm;
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import android.util.ArraySet;
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import android.view.Display.Mode;
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import android.view.DisplayInfo;
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/**
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* Policy to select a lower refresh rate for the display if applicable.
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*/
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class RefreshRatePolicy {
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private final int mLowRefreshRateId;
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private final ArraySet<String> mNonHighRefreshRatePackages = new ArraySet<>();
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private final HighRefreshRateBlacklist mHighRefreshRateBlacklist;
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private final WindowManagerService mWmService;
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RefreshRatePolicy(WindowManagerService wmService, DisplayInfo displayInfo,
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HighRefreshRateBlacklist blacklist) {
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mLowRefreshRateId = findLowRefreshRateModeId(displayInfo);
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mHighRefreshRateBlacklist = blacklist;
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mWmService = wmService;
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}
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/**
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* Finds the mode id with the lowest refresh rate which is >= 60hz and same resolution as the
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* default mode.
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*/
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private int findLowRefreshRateModeId(DisplayInfo displayInfo) {
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Mode mode = displayInfo.getDefaultMode();
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float[] refreshRates = displayInfo.getDefaultRefreshRates();
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float bestRefreshRate = mode.getRefreshRate();
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for (int i = refreshRates.length - 1; i >= 0; i--) {
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if (refreshRates[i] >= 60f && refreshRates[i] < bestRefreshRate) {
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bestRefreshRate = refreshRates[i];
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}
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}
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return displayInfo.findDefaultModeByRefreshRate(bestRefreshRate);
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}
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void addNonHighRefreshRatePackage(String packageName) {
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mNonHighRefreshRatePackages.add(packageName);
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mWmService.requestTraversal();
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}
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void removeNonHighRefreshRatePackage(String packageName) {
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mNonHighRefreshRatePackages.remove(packageName);
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mWmService.requestTraversal();
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}
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int getPreferredModeId(WindowState w) {
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// If app is animating, it's not able to control refresh rate because we want the animation
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// to run in default refresh rate.
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if (w.isAnimating()) {
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return 0;
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}
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// If app requests a certain refresh rate or mode, don't override it.
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if (w.mAttrs.preferredRefreshRate != 0 || w.mAttrs.preferredDisplayModeId != 0) {
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return w.mAttrs.preferredDisplayModeId;
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}
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final String packageName = w.getOwningPackage();
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// If app is using Camera, force it to default (lower) refresh rate.
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if (mNonHighRefreshRatePackages.contains(packageName)) {
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return mLowRefreshRateId;
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}
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// If app is blacklisted using higher refresh rate, return default (lower) refresh rate
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if (mHighRefreshRateBlacklist.isBlacklisted(packageName)) {
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return mLowRefreshRateId;
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}
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return 0;
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}
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}
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