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 public class SharedPreset {
20 
21     private volatile ImagePreset mProducerPreset = null;
22     private volatile ImagePreset mConsumerPreset = null;
23     private volatile ImagePreset mIntermediatePreset = null;
24     private volatile boolean mHasNewContent = false;
25 
enqueuePreset(ImagePreset preset)26     public synchronized void enqueuePreset(ImagePreset preset) {
27         if (mProducerPreset == null || (!mProducerPreset.same(preset))) {
28             mProducerPreset = new ImagePreset(preset);
29         } else {
30             mProducerPreset.updateWith(preset);
31         }
32         ImagePreset temp = mIntermediatePreset;
33         mIntermediatePreset = mProducerPreset;
34         mProducerPreset = temp;
35         mHasNewContent = true;
36     }
37 
dequeuePreset()38     public synchronized ImagePreset dequeuePreset() {
39         if (!mHasNewContent) {
40             return mConsumerPreset;
41         }
42         ImagePreset temp = mConsumerPreset;
43         mConsumerPreset = mIntermediatePreset;
44         mIntermediatePreset = temp;
45         mHasNewContent = false;
46         return mConsumerPreset;
47     }
48 }
49