1 /*
2  * Copyright (C) 2015 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.camera.captureintent;
18 
19 import android.graphics.Bitmap;
20 import android.graphics.BitmapFactory;
21 import android.graphics.Matrix;
22 
23 public class PictureDecoder {
24     /**
25      * Decodes a jpeg byte array into a Bitmap object.
26      *
27      * @param data a byte array of jpeg data
28      * @param downSampleFactor down-sample factor
29      * @param pictureOrientation The picture orientation in degrees.
30      * @param needMirror Whether the bitmap should be flipped horizontally.
31      * @return decoded and down-sampled bitmap
32      */
decode( byte[] data, int downSampleFactor, int pictureOrientation, boolean needMirror)33     public static Bitmap decode(
34             byte[] data, int downSampleFactor, int pictureOrientation, boolean needMirror) {
35         // Downsample the image
36         final BitmapFactory.Options opts = new BitmapFactory.Options();
37         opts.inSampleSize = downSampleFactor;
38         final Bitmap pictureBitmap = BitmapFactory.decodeByteArray(data, 0, data.length, opts);
39         if (pictureOrientation == 0 && !needMirror) {
40             return pictureBitmap;
41         }
42 
43         Matrix m = new Matrix();
44         // Rotate if needed.
45         if (pictureOrientation != 0) {
46             m.setRotate(pictureOrientation);
47         }
48         // Flip horizontally if needed.
49         if (needMirror) {
50             m.postScale(-1f, 1f);
51         }
52         return Bitmap.createBitmap(
53                 pictureBitmap, 0, 0, pictureBitmap.getWidth(), pictureBitmap.getHeight(), m, false);
54     }
55 }
56