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
17package com.android.messaging.ui;
18
19import android.content.res.Resources;
20import android.graphics.Bitmap;
21import android.graphics.Canvas;
22import android.graphics.Matrix;
23import android.graphics.Rect;
24import android.graphics.RectF;
25import android.graphics.drawable.BitmapDrawable;
26import android.view.Gravity;
27
28import com.android.messaging.util.exif.ExifInterface;
29
30/**
31 * A drawable that draws a bitmap in a flipped or rotated orientation without having to adjust the
32 * bitmap
33 */
34public class OrientedBitmapDrawable extends BitmapDrawable {
35    private final ExifInterface.OrientationParams mOrientationParams;
36    private final Rect mDstRect;
37    private int mCenterX;
38    private int mCenterY;
39    private boolean mApplyGravity;
40
41    public static BitmapDrawable create(final int orientation, Resources res, Bitmap bitmap) {
42        if (orientation <= ExifInterface.Orientation.TOP_LEFT) {
43            // No need to adjust the bitmap, so just use a regular BitmapDrawable
44            return new BitmapDrawable(res, bitmap);
45        } else {
46            // Create an oriented bitmap drawable
47            return new OrientedBitmapDrawable(orientation, res, bitmap);
48        }
49    }
50
51    private OrientedBitmapDrawable(final int orientation, Resources res, Bitmap bitmap) {
52        super(res, bitmap);
53        mOrientationParams = ExifInterface.getOrientationParams(orientation);
54        mApplyGravity = true;
55        mDstRect = new Rect();
56    }
57
58    @Override
59    public int getIntrinsicWidth() {
60        if (mOrientationParams.invertDimensions) {
61            return super.getIntrinsicHeight();
62        }
63        return super.getIntrinsicWidth();
64    }
65
66    @Override
67    public int getIntrinsicHeight() {
68        if (mOrientationParams.invertDimensions) {
69            return super.getIntrinsicWidth();
70        }
71        return super.getIntrinsicHeight();
72    }
73
74    @Override
75    protected void onBoundsChange(Rect bounds) {
76        super.onBoundsChange(bounds);
77        mApplyGravity = true;
78    }
79
80    @Override
81    public void draw(Canvas canvas) {
82        if (mApplyGravity) {
83            Gravity.apply(getGravity(), getIntrinsicWidth(), getIntrinsicHeight(), getBounds(),
84                    mDstRect);
85            mCenterX = mDstRect.centerX();
86            mCenterY = mDstRect.centerY();
87            if (mOrientationParams.invertDimensions) {
88                final Matrix matrix = new Matrix();
89                matrix.setRotate(mOrientationParams.rotation, mCenterX, mCenterY);
90                final RectF rotatedRect = new RectF(mDstRect);
91                matrix.mapRect(rotatedRect);
92                mDstRect.set((int) rotatedRect.left, (int) rotatedRect.top, (int) rotatedRect.right,
93                        (int) rotatedRect.bottom);
94            }
95
96            mApplyGravity = false;
97        }
98        canvas.save();
99        canvas.scale(mOrientationParams.scaleX, mOrientationParams.scaleY, mCenterX, mCenterY);
100        canvas.rotate(mOrientationParams.rotation, mCenterX, mCenterY);
101        canvas.drawBitmap(getBitmap(), (Rect) null, mDstRect, getPaint());
102        canvas.restore();
103    }
104}
105