Image.java revision 185a1a7c5f33ecc5cb9a36d23cecb719c8727178 
1/*
2 * Copyright (C) 2009 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.camera.gallery;
18
19import com.android.camera.BitmapManager;
20import com.android.camera.Util;
21
22import android.content.ContentResolver;
23import android.content.ContentValues;
24import android.graphics.Bitmap;
25import android.graphics.BitmapFactory;
26import android.media.ExifInterface;
27import android.net.Uri;
28import android.provider.BaseColumns;
29import android.provider.MediaStore.Images;
30import android.provider.MediaStore.Images.ImageColumns;
31import android.util.Log;
32
33import java.io.IOException;
34
35/**
36 * The class for normal images in gallery.
37 */
38public class Image extends BaseImage implements IImage {
39    private static final String TAG = "BaseImage";
40
41    private ExifInterface mExif;
42
43    private int mRotation;
44
45    public Image(BaseImageList container, ContentResolver cr,
46            long id, int index, Uri uri, String dataPath,
47            String mimeType, long dateTaken, String title,
48            int rotation) {
49        super(container, cr, id, index, uri, dataPath,
50                mimeType, dateTaken, title);
51        mRotation = rotation;
52    }
53
54    @Override
55    public int getDegreesRotated() {
56        return mRotation;
57    }
58
59    protected void setDegreesRotated(int degrees) {
60        if (mRotation == degrees) return;
61        mRotation = degrees;
62        ContentValues values = new ContentValues();
63        values.put(ImageColumns.ORIENTATION, mRotation);
64        mContentResolver.update(mUri, values, null, null);
65
66        //TODO: Consider invalidate the cursor in container
67        // ((BaseImageList) getContainer()).invalidateCursor();
68    }
69
70    public boolean isReadonly() {
71        String mimeType = getMimeType();
72        return !"image/jpeg".equals(mimeType) && !"image/png".equals(mimeType);
73    }
74
75    public boolean isDrm() {
76        return false;
77    }
78
79    /**
80     * Replaces the tag if already there. Otherwise, adds to the exif tags.
81     * @param tag
82     * @param value
83     */
84    public void replaceExifTag(String tag, String value) {
85        if (mExif == null) {
86            loadExifData();
87        }
88        mExif.setAttribute(tag, value);
89    }
90
91    private void loadExifData() {
92        try {
93            mExif = new ExifInterface(mDataPath);
94        } catch (IOException ex) {
95            Log.e(TAG, "cannot read exif", ex);
96        }
97    }
98
99    private void saveExifData() throws IOException {
100        if (mExif != null) {
101            mExif.saveAttributes();
102        }
103    }
104
105    private void setExifRotation(int degrees) {
106        try {
107            degrees %= 360;
108            if (degrees < 0) degrees += 360;
109
110            int orientation = ExifInterface.ORIENTATION_NORMAL;
111            switch (degrees) {
112                case 0:
113                    orientation = ExifInterface.ORIENTATION_NORMAL;
114                    break;
115                case 90:
116                    orientation = ExifInterface.ORIENTATION_ROTATE_90;
117                    break;
118                case 180:
119                    orientation = ExifInterface.ORIENTATION_ROTATE_180;
120                    break;
121                case 270:
122                    orientation = ExifInterface.ORIENTATION_ROTATE_270;
123                    break;
124            }
125
126            replaceExifTag(ExifInterface.TAG_ORIENTATION,
127                    Integer.toString(orientation));
128            saveExifData();
129        } catch (Exception ex) {
130            Log.e(TAG, "unable to save exif data with new orientation "
131                    + fullSizeImageUri(), ex);
132        }
133    }
134
135    /**
136     * Save the rotated image by updating the Exif "Orientation" tag.
137     * @param degrees
138     */
139    public boolean rotateImageBy(int degrees) {
140        int newDegrees = (getDegreesRotated() + degrees) % 360;
141        setExifRotation(newDegrees);
142        setDegreesRotated(newDegrees);
143
144        return true;
145    }
146
147    private static final String[] THUMB_PROJECTION = new String[] {
148        BaseColumns._ID,
149    };
150
151    public Bitmap thumbBitmap(boolean rotateAsNeeded) {
152        Bitmap bitmap = null;
153        BitmapFactory.Options options = new BitmapFactory.Options();
154        options.inDither = false;
155        options.inPreferredConfig = Bitmap.Config.ARGB_8888;
156        bitmap = BitmapManager.instance().getThumbnail(mContentResolver, mId,
157                Images.Thumbnails.MINI_KIND, options, false);
158
159        if (bitmap != null && rotateAsNeeded) {
160            bitmap = Util.rotate(bitmap, getDegreesRotated());
161        }
162
163        return bitmap;
164    }
165}
166