1 /*
2  * Copyright (C) 2014 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.launcher3;
18 
19 import android.content.Context;
20 import android.graphics.Bitmap;
21 import android.graphics.Canvas;
22 import android.graphics.Paint;
23 import android.view.View;
24 
25 public class FastBitmapView extends View {
26 
27     private final Paint mPaint = new Paint(Paint.FILTER_BITMAP_FLAG);
28     private Bitmap mBitmap;
29 
FastBitmapView(Context context)30     public FastBitmapView(Context context) {
31         super(context);
32     }
33 
34     /**
35      * Applies the new bitmap.
36      * @return true if the view was invalidated.
37      */
setBitmap(Bitmap b)38     public boolean setBitmap(Bitmap b) {
39         if (b != mBitmap){
40             if (mBitmap != null) {
41                 invalidate(0, 0, mBitmap.getWidth(), mBitmap.getHeight());
42             }
43             mBitmap = b;
44             if (mBitmap != null) {
45                 invalidate(0, 0, mBitmap.getWidth(), mBitmap.getHeight());
46             }
47             return true;
48         }
49         return false;
50     }
51 
52     @Override
onDraw(Canvas canvas)53     protected void onDraw(Canvas canvas) {
54         if (mBitmap != null) {
55             canvas.drawBitmap(mBitmap, 0, 0, mPaint);
56         }
57     }
58 }
59