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      1 /*
      2  * Copyright (C) 2011 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 com.android.gallery3d.data;
     18 
     19 import android.content.Context;
     20 import android.graphics.Rect;
     21 
     22 import com.android.gallery3d.R;
     23 import com.android.gallery3d.picasasource.PicasaSource;
     24 
     25 import java.util.ArrayList;
     26 import java.util.TreeMap;
     27 
     28 public class FaceClustering extends Clustering {
     29     @SuppressWarnings("unused")
     30     private static final String TAG = "FaceClustering";
     31 
     32     private FaceCluster[] mClusters;
     33     private String mUntaggedString;
     34     private Context mContext;
     35 
     36     private class FaceCluster {
     37         ArrayList<Path> mPaths = new ArrayList<Path>();
     38         String mName;
     39         MediaItem mCoverItem;
     40         Rect mCoverRegion;
     41         int mCoverFaceIndex;
     42 
     43         public FaceCluster(String name) {
     44             mName = name;
     45         }
     46 
     47         public void add(MediaItem item, int faceIndex) {
     48             Path path = item.getPath();
     49             mPaths.add(path);
     50             Face[] faces = item.getFaces();
     51             if (faces != null) {
     52                 Face face = faces[faceIndex];
     53                 if (mCoverItem == null) {
     54                     mCoverItem = item;
     55                     mCoverRegion = face.getPosition();
     56                     mCoverFaceIndex = faceIndex;
     57                 } else {
     58                     Rect region = face.getPosition();
     59                     if (mCoverRegion.width() < region.width() &&
     60                             mCoverRegion.height() < region.height()) {
     61                         mCoverItem = item;
     62                         mCoverRegion = face.getPosition();
     63                         mCoverFaceIndex = faceIndex;
     64                     }
     65                 }
     66             }
     67         }
     68 
     69         public int size() {
     70             return mPaths.size();
     71         }
     72 
     73         public MediaItem getCover() {
     74             if (mCoverItem != null) {
     75                 if (PicasaSource.isPicasaImage(mCoverItem)) {
     76                     return PicasaSource.getFaceItem(mContext, mCoverItem, mCoverFaceIndex);
     77                 } else {
     78                     return mCoverItem;
     79                 }
     80             }
     81             return null;
     82         }
     83     }
     84 
     85     public FaceClustering(Context context) {
     86         mUntaggedString = context.getResources().getString(R.string.untagged);
     87         mContext = context;
     88     }
     89 
     90     @Override
     91     public void run(MediaSet baseSet) {
     92         final TreeMap<Face, FaceCluster> map =
     93                 new TreeMap<Face, FaceCluster>();
     94         final FaceCluster untagged = new FaceCluster(mUntaggedString);
     95 
     96         baseSet.enumerateTotalMediaItems(new MediaSet.ItemConsumer() {
     97             public void consume(int index, MediaItem item) {
     98                 Face[] faces = item.getFaces();
     99                 if (faces == null || faces.length == 0) {
    100                     untagged.add(item, -1);
    101                     return;
    102                 }
    103                 for (int j = 0; j < faces.length; j++) {
    104                     Face face = faces[j];
    105                     FaceCluster cluster = map.get(face);
    106                     if (cluster == null) {
    107                         cluster = new FaceCluster(face.getName());
    108                         map.put(face, cluster);
    109                     }
    110                     cluster.add(item, j);
    111                 }
    112             }
    113         });
    114 
    115         int m = map.size();
    116         mClusters = map.values().toArray(new FaceCluster[m + ((untagged.size() > 0) ? 1 : 0)]);
    117         if (untagged.size() > 0) {
    118             mClusters[m] = untagged;
    119         }
    120     }
    121 
    122     @Override
    123     public int getNumberOfClusters() {
    124         return mClusters.length;
    125     }
    126 
    127     @Override
    128     public ArrayList<Path> getCluster(int index) {
    129         return mClusters[index].mPaths;
    130     }
    131 
    132     @Override
    133     public String getClusterName(int index) {
    134         return mClusters[index].mName;
    135     }
    136 
    137     @Override
    138     public MediaItem getClusterCover(int index) {
    139         return mClusters[index].getCover();
    140     }
    141 }
    142