GalleryBitmapPool.java revision f52ceba89962829aa12f5caba131580e8da85880 
1/*
2 * Copyright (C) 2013 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
17package com.android.photos.data;
18
19import android.graphics.Bitmap;
20import android.graphics.Point;
21import android.util.Pools.Pool;
22import android.util.Pools.SimplePool;
23
24import com.android.photos.data.SparseArrayBitmapPool.Node;
25
26public class GalleryBitmapPool {
27
28    private static final int CAPACITY_BYTES = 20971520;
29    private static final int POOL_INDEX_NONE = -1;
30    private static final int POOL_INDEX_SQUARE = 0;
31    private static final int POOL_INDEX_PHOTO = 1;
32    private static final int POOL_INDEX_MISC = 2;
33
34    private static final Point[] COMMON_PHOTO_ASPECT_RATIOS =
35        { new Point(4, 3), new Point(3, 2), new Point(16, 9) };
36
37    private int mCapacityBytes;
38    private SparseArrayBitmapPool [] mPools;
39    private Pool<Node> mSharedNodePool = new SimplePool<Node>(128);
40
41    private GalleryBitmapPool(int capacityBytes) {
42        mPools = new SparseArrayBitmapPool[3];
43        mPools[POOL_INDEX_SQUARE] = new SparseArrayBitmapPool(capacityBytes / 3, mSharedNodePool);
44        mPools[POOL_INDEX_PHOTO] = new SparseArrayBitmapPool(capacityBytes / 3, mSharedNodePool);
45        mPools[POOL_INDEX_MISC] = new SparseArrayBitmapPool(capacityBytes / 3, mSharedNodePool);
46        mCapacityBytes = capacityBytes;
47    }
48
49    private static GalleryBitmapPool sInstance;
50    public static GalleryBitmapPool getInstance() {
51        if (sInstance == null) {
52            sInstance = new GalleryBitmapPool(CAPACITY_BYTES);
53        }
54        return sInstance;
55    }
56
57    private SparseArrayBitmapPool getPoolForDimensions(int width, int height) {
58        int index = getPoolIndexForDimensions(width, height);
59        if (index == POOL_INDEX_NONE) {
60            return null;
61        } else {
62            return mPools[index];
63        }
64    }
65
66    private int getPoolIndexForDimensions(int width, int height) {
67        if (width <= 0 || height <= 0) {
68            return POOL_INDEX_NONE;
69        }
70        if (width == height) {
71            return POOL_INDEX_SQUARE;
72        }
73        int min, max;
74        if (width > height) {
75            min = height;
76            max = width;
77        } else {
78            min = width;
79            max = height;
80        }
81        for (Point ar : COMMON_PHOTO_ASPECT_RATIOS) {
82            if (min * ar.x == max * ar.y) {
83                return POOL_INDEX_PHOTO;
84            }
85        }
86        return POOL_INDEX_MISC;
87    }
88
89    public synchronized int getCapacity() {
90        return mCapacityBytes;
91    }
92
93    public synchronized int getSize() {
94        int total = 0;
95        for (SparseArrayBitmapPool p : mPools) {
96            total += p.getSize();
97        }
98        return total;
99    }
100
101    public Bitmap get(int width, int height) {
102        SparseArrayBitmapPool pool = getPoolForDimensions(width, height);
103        if (pool == null) {
104            return null;
105        } else {
106            return pool.get(width, height);
107        }
108    }
109
110    public boolean put(Bitmap b) {
111        if (b == null) {
112            return false;
113        }
114        SparseArrayBitmapPool pool = getPoolForDimensions(b.getWidth(), b.getHeight());
115        if (pool == null) {
116            b.recycle();
117            return false;
118        } else {
119            return pool.put(b);
120        }
121    }
122
123    public void clear() {
124        for (SparseArrayBitmapPool p : mPools) {
125            p.clear();
126        }
127    }
128}
129