RotateBitmap.java revision 1bb0c42b2a62f580eea4764d6a4434ffecfbf353 
1package com.cooliris.media;
2
3/*
4 * Copyright (C) 2009 The Android Open Source Project
5 *
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
9 *
10 *      http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18
19import android.graphics.Bitmap;
20import android.graphics.Matrix;
21
22public class RotateBitmap {
23    public static final String TAG = "RotateBitmap";
24    private Bitmap mBitmap;
25    private int mRotation;
26
27    public RotateBitmap(Bitmap bitmap) {
28        mBitmap = bitmap;
29        mRotation = 0;
30    }
31
32    public RotateBitmap(Bitmap bitmap, int rotation) {
33        mBitmap = bitmap;
34        mRotation = rotation % 360;
35    }
36
37    public void setRotation(int rotation) {
38        mRotation = rotation;
39    }
40
41    public int getRotation() {
42        return mRotation;
43    }
44
45    public Bitmap getBitmap() {
46        return mBitmap;
47    }
48
49    public void setBitmap(Bitmap bitmap) {
50        mBitmap = bitmap;
51    }
52
53    public Matrix getRotateMatrix() {
54        // By default this is an identity matrix.
55        Matrix matrix = new Matrix();
56        if (mRotation != 0) {
57            // We want to do the rotation at origin, but since the bounding
58            // rectangle will be changed after rotation, so the delta values
59            // are based on old & new width/height respectively.
60            int cx = mBitmap.getWidth() / 2;
61            int cy = mBitmap.getHeight() / 2;
62            matrix.preTranslate(-cx, -cy);
63            matrix.postRotate(mRotation);
64            matrix.postTranslate(getWidth() / 2, getHeight() / 2);
65        }
66        return matrix;
67    }
68
69    public boolean isOrientationChanged() {
70        return (mRotation / 90) % 2 != 0;
71    }
72
73    public int getHeight() {
74        if (isOrientationChanged()) {
75            return mBitmap.getWidth();
76        } else {
77            return mBitmap.getHeight();
78        }
79    }
80
81    public int getWidth() {
82        if (isOrientationChanged()) {
83            return mBitmap.getHeight();
84        } else {
85            return mBitmap.getWidth();
86        }
87    }
88
89    public void recycle() {
90        if (mBitmap != null) {
91            mBitmap.recycle();
92            mBitmap = null;
93        }
94    }
95}
96