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