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