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
17package com.android.gallery3d.ingest.data;
18
19import android.annotation.TargetApi;
20import android.content.Context;
21import android.graphics.Bitmap;
22import android.graphics.BitmapFactory;
23import android.mtp.MtpDevice;
24import android.os.Build;
25import android.util.DisplayMetrics;
26import android.view.WindowManager;
27
28import com.android.gallery3d.data.Exif;
29import com.android.photos.data.GalleryBitmapPool;
30
31/**
32 * Helper class for fetching bitmaps from MTP devices.
33 */
34@TargetApi(Build.VERSION_CODES.HONEYCOMB_MR1)
35public 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