1 /*
2  * Copyright (C) 2010 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.graphics.Bitmap;
20 import android.graphics.BitmapFactory;
21 
22 import com.android.gallery3d.app.GalleryApp;
23 import com.android.gallery3d.common.BitmapUtils;
24 import com.android.gallery3d.data.BytesBufferPool.BytesBuffer;
25 import com.android.gallery3d.util.ThreadPool.Job;
26 import com.android.gallery3d.util.ThreadPool.JobContext;
27 
28 abstract class ImageCacheRequest implements Job<Bitmap> {
29     private static final String TAG = "ImageCacheRequest";
30 
31     protected GalleryApp mApplication;
32     private Path mPath;
33     private int mType;
34     private int mTargetSize;
35     private long mTimeModified;
36 
ImageCacheRequest(GalleryApp application, Path path, long timeModified, int type, int targetSize)37     public ImageCacheRequest(GalleryApp application,
38             Path path, long timeModified, int type, int targetSize) {
39         mApplication = application;
40         mPath = path;
41         mType = type;
42         mTargetSize = targetSize;
43         mTimeModified = timeModified;
44     }
45 
debugTag()46     private String debugTag() {
47         return mPath + "," + mTimeModified + "," +
48                 ((mType == MediaItem.TYPE_THUMBNAIL) ? "THUMB" :
49                 (mType == MediaItem.TYPE_MICROTHUMBNAIL) ? "MICROTHUMB" : "?");
50     }
51 
52     @Override
run(JobContext jc)53     public Bitmap run(JobContext jc) {
54         ImageCacheService cacheService = mApplication.getImageCacheService();
55 
56         BytesBuffer buffer = MediaItem.getBytesBufferPool().get();
57         try {
58             boolean found = cacheService.getImageData(mPath, mTimeModified, mType, buffer);
59             if (jc.isCancelled()) return null;
60             if (found) {
61                 BitmapFactory.Options options = new BitmapFactory.Options();
62                 options.inPreferredConfig = Bitmap.Config.ARGB_8888;
63                 Bitmap bitmap;
64                 if (mType == MediaItem.TYPE_MICROTHUMBNAIL) {
65                     bitmap = DecodeUtils.decodeUsingPool(jc,
66                             buffer.data, buffer.offset, buffer.length, options);
67                 } else {
68                     bitmap = DecodeUtils.decodeUsingPool(jc,
69                             buffer.data, buffer.offset, buffer.length, options);
70                 }
71                 if (bitmap == null && !jc.isCancelled()) {
72                     Log.w(TAG, "decode cached failed " + debugTag());
73                 }
74                 return bitmap;
75             }
76         } finally {
77             MediaItem.getBytesBufferPool().recycle(buffer);
78         }
79         Bitmap bitmap = onDecodeOriginal(jc, mType);
80         if (jc.isCancelled()) return null;
81 
82         if (bitmap == null) {
83             Log.w(TAG, "decode orig failed " + debugTag());
84             return null;
85         }
86 
87         if (mType == MediaItem.TYPE_MICROTHUMBNAIL) {
88             bitmap = BitmapUtils.resizeAndCropCenter(bitmap, mTargetSize, true);
89         } else {
90             bitmap = BitmapUtils.resizeDownBySideLength(bitmap, mTargetSize, true);
91         }
92         if (jc.isCancelled()) return null;
93 
94         byte[] array = BitmapUtils.compressToBytes(bitmap);
95         if (jc.isCancelled()) return null;
96 
97         cacheService.putImageData(mPath, mTimeModified, mType, array);
98         return bitmap;
99     }
100 
onDecodeOriginal(JobContext jc, int targetSize)101     public abstract Bitmap onDecodeOriginal(JobContext jc, int targetSize);
102 }
103