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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     private String debugTag() {
     45         return mPath + "," +
     46                 ((mType == MediaItem.TYPE_THUMBNAIL) ? "THUMB" :
     47                 (mType == MediaItem.TYPE_MICROTHUMBNAIL) ? "MICROTHUMB" : "?");
     48     }
     49 
     50     @Override
     51     public Bitmap run(JobContext jc) {
     52         ImageCacheService cacheService = mApplication.getImageCacheService();
     53 
     54         BytesBuffer buffer = MediaItem.getBytesBufferPool().get();
     55         try {
     56             boolean found = cacheService.getImageData(mPath, mType, buffer);
     57             if (jc.isCancelled()) return null;
     58             if (found) {
     59                 BitmapFactory.Options options = new BitmapFactory.Options();
     60                 options.inPreferredConfig = Bitmap.Config.ARGB_8888;
     61                 Bitmap bitmap;
     62                 if (mType == MediaItem.TYPE_MICROTHUMBNAIL) {
     63                     bitmap = DecodeUtils.decodeUsingPool(jc,
     64                             buffer.data, buffer.offset, buffer.length, options);
     65                 } else {
     66                     bitmap = DecodeUtils.decodeUsingPool(jc,
     67                             buffer.data, buffer.offset, buffer.length, options);
     68                 }
     69                 if (bitmap == null && !jc.isCancelled()) {
     70                     Log.w(TAG, "decode cached failed " + debugTag());
     71                 }
     72                 return bitmap;
     73             }
     74         } finally {
     75             MediaItem.getBytesBufferPool().recycle(buffer);
     76         }
     77         Bitmap bitmap = onDecodeOriginal(jc, mType);
     78         if (jc.isCancelled()) return null;
     79 
     80         if (bitmap == null) {
     81             Log.w(TAG, "decode orig failed " + debugTag());
     82             return null;
     83         }
     84 
     85         if (mType == MediaItem.TYPE_MICROTHUMBNAIL) {
     86             bitmap = BitmapUtils.resizeAndCropCenter(bitmap, mTargetSize, true);
     87         } else {
     88             bitmap = BitmapUtils.resizeDownBySideLength(bitmap, mTargetSize, true);
     89         }
     90         if (jc.isCancelled()) return null;
     91 
     92         byte[] array = BitmapUtils.compressToBytes(bitmap);
     93         if (jc.isCancelled()) return null;
     94 
     95         cacheService.putImageData(mPath, mType, array);
     96         return bitmap;
     97     }
     98 
     99     public abstract Bitmap onDecodeOriginal(JobContext jc, int targetSize);
    100 }
    101