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      1 /*
      2  * Copyright (C) 2013 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.ingest.data;
     18 
     19 import android.annotation.TargetApi;
     20 import android.content.Context;
     21 import android.graphics.Bitmap;
     22 import android.graphics.BitmapFactory;
     23 import android.mtp.MtpDevice;
     24 import android.os.Build;
     25 import android.util.DisplayMetrics;
     26 import android.view.WindowManager;
     27 
     28 import com.android.gallery3d.data.Exif;
     29 import com.android.photos.data.GalleryBitmapPool;
     30 
     31 /**
     32  * Helper class for fetching bitmaps from MTP devices.
     33  */
     34 @TargetApi(Build.VERSION_CODES.HONEYCOMB_MR1)
     35 public class MtpBitmapFetch {
     36   private static int sMaxSize = 0;
     37 
     38   public static void recycleThumbnail(Bitmap b) {
     39     if (b != null) {
     40       GalleryBitmapPool.getInstance().put(b);
     41     }
     42   }
     43 
     44   public static Bitmap getThumbnail(MtpDevice device, IngestObjectInfo info) {
     45     byte[] imageBytes = device.getThumbnail(info.getObjectHandle());
     46     if (imageBytes == null) {
     47       return null;
     48     }
     49     BitmapFactory.Options o = new BitmapFactory.Options();
     50     o.inJustDecodeBounds = true;
     51     BitmapFactory.decodeByteArray(imageBytes, 0, imageBytes.length, o);
     52     if (o.outWidth == 0 || o.outHeight == 0) {
     53       return null;
     54     }
     55     o.inBitmap = GalleryBitmapPool.getInstance().get(o.outWidth, o.outHeight);
     56     o.inMutable = true;
     57     o.inJustDecodeBounds = false;
     58     o.inSampleSize = 1;
     59     try {
     60       return BitmapFactory.decodeByteArray(imageBytes, 0, imageBytes.length, o);
     61     } catch (IllegalArgumentException e) {
     62       // BitmapFactory throws an exception rather than returning null
     63       // when image decoding fails and an existing bitmap was supplied
     64       // for recycling, even if the failure was not caused by the use
     65       // of that bitmap.
     66       return BitmapFactory.decodeByteArray(imageBytes, 0, imageBytes.length);
     67     }
     68   }
     69 
     70   public static BitmapWithMetadata getFullsize(MtpDevice device, IngestObjectInfo info) {
     71     return getFullsize(device, info, sMaxSize);
     72   }
     73 
     74   public static BitmapWithMetadata getFullsize(MtpDevice device, IngestObjectInfo info,
     75       int maxSide) {
     76     byte[] imageBytes = device.getObject(info.getObjectHandle(), info.getCompressedSize());
     77     if (imageBytes == null) {
     78       return null;
     79     }
     80     Bitmap created;
     81     if (maxSide > 0) {
     82       BitmapFactory.Options o = new BitmapFactory.Options();
     83       o.inJustDecodeBounds = true;
     84       BitmapFactory.decodeByteArray(imageBytes, 0, imageBytes.length, o);
     85       int w = o.outWidth;
     86       int h = o.outHeight;
     87       int comp = Math.max(h, w);
     88       int sampleSize = 1;
     89       while ((comp >> 1) >= maxSide) {
     90         comp = comp >> 1;
     91         sampleSize++;
     92       }
     93       o.inSampleSize = sampleSize;
     94       o.inJustDecodeBounds = false;
     95       created = BitmapFactory.decodeByteArray(imageBytes, 0, imageBytes.length, o);
     96     } else {
     97       created = BitmapFactory.decodeByteArray(imageBytes, 0, imageBytes.length);
     98     }
     99     if (created == null) {
    100       return null;
    101     }
    102 
    103     int orientation = Exif.getOrientation(imageBytes);
    104     return new BitmapWithMetadata(created, orientation);
    105   }
    106 
    107   public static void configureForContext(Context context) {
    108     DisplayMetrics metrics = new DisplayMetrics();
    109     WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
    110     wm.getDefaultDisplay().getMetrics(metrics);
    111     sMaxSize = Math.max(metrics.heightPixels, metrics.widthPixels);
    112   }
    113 }
    114