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      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 
     36     public ImageCacheRequest(GalleryApp application,
     37             Path path, int type, int targetSize) {
     38         mApplication = application;
     39         mPath = path;
     40         mType = type;
     41         mTargetSize = targetSize;
     42     }
     43 
     44     @Override
     45     public Bitmap run(JobContext jc) {
     46         String debugTag = mPath + "," +
     47                  ((mType == MediaItem.TYPE_THUMBNAIL) ? "THUMB" :
     48                  (mType == MediaItem.TYPE_MICROTHUMBNAIL) ? "MICROTHUMB" : "?");
     49         ImageCacheService cacheService = mApplication.getImageCacheService();
     50 
     51         BytesBuffer buffer = MediaItem.getBytesBufferPool().get();
     52         try {
     53             boolean found = cacheService.getImageData(mPath, mType, buffer);
     54             if (jc.isCancelled()) return null;
     55             if (found) {
     56                 BitmapFactory.Options options = new BitmapFactory.Options();
     57                 options.inPreferredConfig = Bitmap.Config.ARGB_8888;
     58                 Bitmap bitmap;
     59                 if (mType == MediaItem.TYPE_MICROTHUMBNAIL) {
     60                     bitmap = MediaItem.getMicroThumbPool().decode(jc,
     61                             buffer.data, buffer.offset, buffer.length, options);
     62                 } else {
     63                     bitmap = MediaItem.getThumbPool().decode(jc,
     64                             buffer.data, buffer.offset, buffer.length, options);
     65                 }
     66                 if (bitmap == null && !jc.isCancelled()) {
     67                     Log.w(TAG, "decode cached failed " + debugTag);
     68                 }
     69                 return bitmap;
     70             }
     71         } finally {
     72             MediaItem.getBytesBufferPool().recycle(buffer);
     73         }
     74         Bitmap bitmap = onDecodeOriginal(jc, mType);
     75         if (jc.isCancelled()) return null;
     76 
     77         if (bitmap == null) {
     78             Log.w(TAG, "decode orig failed " + debugTag);
     79             return null;
     80         }
     81 
     82         if (mType == MediaItem.TYPE_MICROTHUMBNAIL) {
     83             bitmap = BitmapUtils.resizeAndCropCenter(bitmap, mTargetSize, true);
     84         } else {
     85             bitmap = BitmapUtils.resizeDownBySideLength(bitmap, mTargetSize, true);
     86         }
     87         if (jc.isCancelled()) return null;
     88 
     89         byte[] array = BitmapUtils.compressToBytes(bitmap);
     90         if (jc.isCancelled()) return null;
     91 
     92         cacheService.putImageData(mPath, mType, array);
     93         return bitmap;
     94     }
     95 
     96     public abstract Bitmap onDecodeOriginal(JobContext jc, int targetSize);
     97 }
     98