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      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 
     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 
     45     public synchronized Buffer getProducer() {
     46         return mProducer;
     47     }
     48 
     49     public synchronized Buffer getConsumer() {
     50         return mConsumer;
     51     }
     52 
     53     public synchronized void swapProducer() {
     54         Buffer intermediate = mIntermediate;
     55         mIntermediate = mProducer;
     56         mProducer = intermediate;
     57         mNeedsSwap = true;
     58     }
     59 
     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 
     70     public synchronized void invalidate() {
     71         mNeedsRepaint = true;
     72     }
     73 
     74     public synchronized boolean checkRepaintNeeded() {
     75         if (mNeedsRepaint) {
     76             mNeedsRepaint = false;
     77             return true;
     78         }
     79         return false;
     80     }
     81 
     82 }
     83 
     84