| /* |
| * Copyright (C) 2019 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 com.android.server.wm.utils; |
| |
| import android.graphics.Rect; |
| import android.graphics.Region; |
| import android.graphics.RegionIterator; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.function.Consumer; |
| |
| /** |
| * Utility methods to handle Regions. |
| */ |
| public class RegionUtils { |
| |
| private RegionUtils() {} |
| |
| |
| /** |
| * Converts a list of rects into a {@code Region}. |
| * |
| * @param rects the list of rects to convert |
| * @param outRegion the Region to set to the list of rects |
| */ |
| public static void rectListToRegion(List<Rect> rects, Region outRegion) { |
| outRegion.setEmpty(); |
| final int n = rects.size(); |
| for (int i = 0; i < n; i++) { |
| outRegion.union(rects.get(i)); |
| } |
| } |
| |
| /** |
| * Applies actions on each rect contained within a {@code Region}. |
| * |
| * Order is bottom to top, then right to left. |
| * |
| * @param region the given region. |
| * @param rectConsumer the action holder. |
| */ |
| public static void forEachRectReverse(Region region, Consumer<Rect> rectConsumer) { |
| final RegionIterator it = new RegionIterator(region); |
| final ArrayList<Rect> rects = new ArrayList<>(); |
| final Rect rect = new Rect(); |
| while (it.next(rect)) { |
| rects.add(new Rect(rect)); |
| } |
| // TODO: instead of creating an array and reversing it, expose the reverse iterator through |
| // JNI. |
| Collections.reverse(rects); |
| rects.forEach(rectConsumer); |
| } |
| } |