content: /*
   * Copyright 2018 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;
  
  import android.graphics.Rect;
  import android.graphics.Region;
  import android.util.SparseArray;
  
  /**
   * A holder that contains a collection of regions identified by int id. Each individual region can
   * be updated separately.
   */
  class TapExcludeRegionHolder {
      private SparseArray<Region> mTapExcludeRegions = new SparseArray<>();
  
      /** Update the specified region with provided position and size. */
      void updateRegion(int regionId, Region region) {
          // Remove the previous one because there is a new one incoming.
          mTapExcludeRegions.remove(regionId);
  
          if (region == null || region.isEmpty()) {
              // The incoming region is invalid. Don't use it.
              return;
          }
  
          mTapExcludeRegions.put(regionId, region);
      }
  
      /**
       * Union the provided region with current region formed by this container.
       */
      void amendRegion(Region region, Rect bounds) {
          for (int i = mTapExcludeRegions.size() - 1; i >= 0; --i) {
              final Region r = mTapExcludeRegions.valueAt(i);
              if (bounds != null) {
                  r.op(bounds, Region.Op.INTERSECT);
              }
              region.op(r, Region.Op.UNION);
          }
      }
  
      /**
       * Return true if tap exclude region is empty.
       */
      boolean isEmpty() {
          return mTapExcludeRegions.size() == 0;
      }
  }
  