1 /*
2  * Copyright (C) 2013 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.gallery3d.filtershow.pipeline;
18 
19 import android.graphics.Bitmap;
20 
21 public class SharedBuffer {
22 
23     private static final String LOGTAG = "SharedBuffer";
24 
25     private volatile Buffer mProducer = null;
26     private volatile Buffer mConsumer = null;
27     private volatile Buffer mIntermediate = null;
28 
29     private volatile boolean mNeedsSwap = false;
30     private volatile boolean mNeedsRepaint = true;
31 
setProducer(Bitmap producer)32     public synchronized void setProducer(Bitmap producer) {
33         if (mProducer != null
34                 && !mProducer.isSameSize(producer)) {
35             mProducer.remove();
36             mProducer = null;
37         }
38         if (mProducer == null) {
39             mProducer = new Buffer(producer);
40         } else {
41             mProducer.useBitmap(producer);
42         }
43     }
44 
getProducer()45     public synchronized Buffer getProducer() {
46         return mProducer;
47     }
48 
getConsumer()49     public synchronized Buffer getConsumer() {
50         return mConsumer;
51     }
52 
swapProducer()53     public synchronized void swapProducer() {
54         Buffer intermediate = mIntermediate;
55         mIntermediate = mProducer;
56         mProducer = intermediate;
57         mNeedsSwap = true;
58     }
59 
swapConsumerIfNeeded()60     public synchronized void swapConsumerIfNeeded() {
61         if (!mNeedsSwap) {
62             return;
63         }
64         Buffer intermediate = mIntermediate;
65         mIntermediate = mConsumer;
66         mConsumer = intermediate;
67         mNeedsSwap = false;
68     }
69 
invalidate()70     public synchronized void invalidate() {
71         mNeedsRepaint = true;
72     }
73 
checkRepaintNeeded()74     public synchronized boolean checkRepaintNeeded() {
75         if (mNeedsRepaint) {
76             mNeedsRepaint = false;
77             return true;
78         }
79         return false;
80     }
81 
82 }
83 
84