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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     private long mTimeModified;
     36 
     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 
     46     private String debugTag() {
     47         return mPath + "," + mTimeModified + "," +
     48                 ((mType == MediaItem.TYPE_THUMBNAIL) ? "THUMB" :
     49                 (mType == MediaItem.TYPE_MICROTHUMBNAIL) ? "MICROTHUMB" : "?");
     50     }
     51 
     52     @Override
     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 
    101     public abstract Bitmap onDecodeOriginal(JobContext jc, int targetSize);
    102 }
    103