1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
/*
* Copyright (C) 2013 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.photos.data;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.BitmapFactory.Options;
import android.util.Log;
import android.util.Pools.Pool;
import android.util.Pools.SynchronizedPool;
import com.android.gallery3d.common.Utils;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
/**
* BitmapDecoder keeps a pool of temporary storage to reuse for decoding
* bitmaps. It also simplifies the multi-stage decoding required to efficiently
* use GalleryBitmapPool. The static methods decode and decodeFile can be used
* to decode a bitmap from GalleryBitmapPool. The bitmap may be returned
* directly to GalleryBitmapPool or use the put method here when the bitmap is
* ready to be recycled.
*/
public class BitmapDecoder {
private static final String TAG = BitmapDecoder.class.getSimpleName();
private static final int POOL_SIZE = 4;
private static final int TEMP_STORAGE_SIZE_BYTES = 16 * 1024;
private static final int HEADER_MAX_SIZE = 128 * 1024;
private static final Pool<BitmapFactory.Options> sOptions =
new SynchronizedPool<BitmapFactory.Options>(POOL_SIZE);
private interface Decoder<T> {
Bitmap decode(T input, BitmapFactory.Options options);
boolean decodeBounds(T input, BitmapFactory.Options options);
}
private static abstract class OnlyDecode<T> implements Decoder<T> {
@Override
public boolean decodeBounds(T input, BitmapFactory.Options options) {
decode(input, options);
return true;
}
}
private static final Decoder<InputStream> sStreamDecoder = new Decoder<InputStream>() {
@Override
public Bitmap decode(InputStream is, Options options) {
return BitmapFactory.decodeStream(is, null, options);
}
@Override
public boolean decodeBounds(InputStream is, Options options) {
is.mark(HEADER_MAX_SIZE);
BitmapFactory.decodeStream(is, null, options);
try {
is.reset();
return true;
} catch (IOException e) {
Log.e(TAG, "Could not decode stream to bitmap", e);
return false;
}
}
};
private static final Decoder<String> sFileDecoder = new OnlyDecode<String>() {
@Override
public Bitmap decode(String filePath, Options options) {
return BitmapFactory.decodeFile(filePath, options);
}
};
private static final Decoder<byte[]> sByteArrayDecoder = new OnlyDecode<byte[]>() {
@Override
public Bitmap decode(byte[] data, Options options) {
return BitmapFactory.decodeByteArray(data, 0, data.length, options);
}
};
private static <T> Bitmap delegateDecode(Decoder<T> decoder, T input) {
BitmapFactory.Options options = getOptions();
GalleryBitmapPool pool = GalleryBitmapPool.getInstance();
try {
options.inJustDecodeBounds = true;
if (!decoder.decodeBounds(input, options)) {
return null;
}
options.inJustDecodeBounds = false;
Bitmap reuseBitmap = pool.get(options.outWidth, options.outHeight);
options.inBitmap = reuseBitmap;
Bitmap decodedBitmap = decoder.decode(input, options);
if (reuseBitmap != null && decodedBitmap != reuseBitmap) {
pool.put(reuseBitmap);
}
return decodedBitmap;
} catch (IllegalArgumentException e) {
if (options.inBitmap == null) {
throw e;
}
pool.put(options.inBitmap);
options.inBitmap = null;
return decoder.decode(input, options);
} finally {
options.inBitmap = null;
options.inJustDecodeBounds = false;
sOptions.release(options);
}
}
public static Bitmap decode(InputStream in) {
try {
if (!in.markSupported()) {
in = new BufferedInputStream(in);
}
return delegateDecode(sStreamDecoder, in);
} finally {
Utils.closeSilently(in);
}
}
public static Bitmap decode(File file) {
return decodeFile(file.getPath());
}
public static Bitmap decodeFile(String path) {
return delegateDecode(sFileDecoder, path);
}
public static Bitmap decodeByteArray(byte[] data) {
return delegateDecode(sByteArrayDecoder, data);
}
public static void put(Bitmap bitmap) {
GalleryBitmapPool.getInstance().put(bitmap);
}
private static BitmapFactory.Options getOptions() {
BitmapFactory.Options opts = sOptions.acquire();
if (opts == null) {
opts = new BitmapFactory.Options();
opts.inMutable = true;
opts.inPreferredConfig = Config.ARGB_8888;
opts.inSampleSize = 1;
opts.inTempStorage = new byte[TEMP_STORAGE_SIZE_BYTES];
}
return opts;
}
}
|
