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      1 /*
      2  * Copyright (C) 2014 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 android.hardware.camera2.legacy;
     18 
     19 import android.hardware.Camera;
     20 
     21 import java.util.Collections;
     22 import java.util.Comparator;
     23 import java.util.List;
     24 
     25 import static com.android.internal.util.Preconditions.*;
     26 
     27 /**
     28  * Comparator for api1 {@link Camera.Size} objects by the area.
     29  *
     30  * <p>This comparator totally orders by rectangle area. Tie-breaks on width.</p>
     31  */
     32 @SuppressWarnings("deprecation")
     33 public class SizeAreaComparator implements Comparator<Camera.Size> {
     34     /**
     35      * {@inheritDoc}
     36      */
     37     @Override
     38     public int compare(Camera.Size size, Camera.Size size2) {
     39         checkNotNull(size, "size must not be null");
     40         checkNotNull(size2, "size2 must not be null");
     41 
     42         if (size.equals(size2)) {
     43             return 0;
     44         }
     45 
     46         long width = size.width;
     47         long width2 = size2.width;
     48         long area = width * size.height;
     49         long area2 = width2 * size2.height;
     50 
     51         if (area == area2) {
     52             return (width > width2) ? 1 : -1;
     53         }
     54 
     55         return (area > area2) ? 1 : -1;
     56     }
     57 
     58     /**
     59      * Get the largest api1 {@code Camera.Size} from the list by comparing each size's area
     60      * by each other using {@link SizeAreaComparator}.
     61      *
     62      * @param sizes a non-{@code null} list of non-{@code null} sizes
     63      * @return a non-{@code null} size
     64      *
     65      * @throws NullPointerException if {@code sizes} or any elements in it were {@code null}
     66      */
     67     public static Camera.Size findLargestByArea(List<Camera.Size> sizes) {
     68         checkNotNull(sizes, "sizes must not be null");
     69 
     70         return Collections.max(sizes, new SizeAreaComparator());
     71     }
     72 }
     73