1/* 2 * Copyright (C) 2012 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 17package com.android.gallery3d.filtershow.cache; 18 19import android.graphics.Bitmap; 20 21import com.android.gallery3d.filtershow.imageshow.ImageShow; 22import com.android.gallery3d.filtershow.presets.ImagePreset; 23 24import java.util.Vector; 25 26public class DirectPresetCache implements Cache { 27 28 private static final String LOGTAG = "DirectPresetCache"; 29 private Bitmap mOriginalBitmap = null; 30 private final Vector<ImageShow> mObservers = new Vector<ImageShow>(); 31 private final Vector<CachedPreset> mCache = new Vector<CachedPreset>(); 32 private int mCacheSize = 1; 33 private final Bitmap.Config mBitmapConfig = Bitmap.Config.ARGB_8888; 34 private long mGlobalAge = 0; 35 private ImageLoader mLoader = null; 36 37 protected class CachedPreset { 38 private Bitmap mBitmap = null; 39 private ImagePreset mPreset = null; 40 private long mAge = 0; 41 private boolean mBusy = false; 42 43 public void setBusy(boolean value) { 44 mBusy = value; 45 } 46 47 public boolean busy() { 48 return mBusy; 49 } 50 } 51 52 public DirectPresetCache(ImageLoader loader, int size) { 53 mLoader = loader; 54 mCacheSize = size; 55 } 56 57 @Override 58 public void setOriginalBitmap(Bitmap bitmap) { 59 mOriginalBitmap = bitmap; 60 notifyObservers(); 61 } 62 63 public void notifyObservers() { 64 mLoader.getActivity().runOnUiThread(mNotifyObserversRunnable); 65 } 66 67 private final Runnable mNotifyObserversRunnable = new Runnable() { 68 @Override 69 public void run() { 70 for (int i = 0; i < mObservers.size(); i++) { 71 ImageShow imageShow = mObservers.elementAt(i); 72 imageShow.invalidate(); 73 imageShow.updateImage(); 74 } 75 } 76 }; 77 78 @Override 79 public void addObserver(ImageShow observer) { 80 if (!mObservers.contains(observer)) { 81 mObservers.add(observer); 82 } 83 } 84 85 private CachedPreset getCachedPreset(ImagePreset preset) { 86 for (int i = 0; i < mCache.size(); i++) { 87 CachedPreset cache = mCache.elementAt(i); 88 if (cache.mPreset == preset) { 89 return cache; 90 } 91 } 92 return null; 93 } 94 95 @Override 96 public Bitmap get(ImagePreset preset) { 97 // Log.v(LOGTAG, "get preset " + preset.name() + " : " + preset); 98 CachedPreset cache = getCachedPreset(preset); 99 if (cache != null && !cache.mBusy) { 100 return cache.mBitmap; 101 } 102 // Log.v(LOGTAG, "didn't find preset " + preset.name() + " : " + preset 103 // + " we have " + mCache.size() + " elts / " + mCacheSize); 104 return null; 105 } 106 107 @Override 108 public void reset(ImagePreset preset) { 109 CachedPreset cache = getCachedPreset(preset); 110 if (cache != null && !cache.mBusy) { 111 cache.mBitmap = null; 112 willCompute(cache); 113 } 114 } 115 116 private CachedPreset getOldestCachedPreset() { 117 CachedPreset found = null; 118 for (int i = 0; i < mCache.size(); i++) { 119 CachedPreset cache = mCache.elementAt(i); 120 if (cache.mBusy) { 121 continue; 122 } 123 if (found == null) { 124 found = cache; 125 } else { 126 if (found.mAge > cache.mAge) { 127 found = cache; 128 } 129 } 130 } 131 return found; 132 } 133 134 protected void willCompute(CachedPreset cache) { 135 if (cache == null) { 136 return; 137 } 138 cache.mBusy = true; 139 compute(cache); 140 didCompute(cache); 141 } 142 143 protected void didCompute(CachedPreset cache) { 144 cache.mBusy = false; 145 notifyObservers(); 146 } 147 148 protected void compute(CachedPreset cache) { 149 cache.mBitmap = null; 150 cache.mBitmap = mOriginalBitmap.copy(mBitmapConfig, true); 151 float scaleFactor = (float) cache.mBitmap.getWidth() / (float) mLoader.getOriginalBounds().width(); 152 if (scaleFactor < 1.0f) { 153 cache.mPreset.setIsHighQuality(false); 154 } 155 cache.mPreset.setScaleFactor(scaleFactor); 156 cache.mBitmap = cache.mPreset.apply(cache.mBitmap); 157 cache.mAge = mGlobalAge++; 158 } 159 160 @Override 161 public void prepare(ImagePreset preset) { 162 // Log.v(LOGTAG, "prepare preset " + preset.name() + " : " + preset); 163 CachedPreset cache = getCachedPreset(preset); 164 if (cache == null || (cache.mBitmap == null && !cache.mBusy)) { 165 if (cache == null) { 166 if (mCache.size() < mCacheSize) { 167 cache = new CachedPreset(); 168 mCache.add(cache); 169 } else { 170 cache = getOldestCachedPreset(); 171 } 172 } 173 if (cache != null) { 174 cache.mPreset = preset; 175 willCompute(cache); 176 } 177 } 178 179 } 180 181} 182