/*****************************************************************************
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* BitmapCache.java
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*****************************************************************************
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* Copyright © 2012 VLC authors and VideoLAN
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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package org.videolan.vlc;
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import android.app.ActivityManager;
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import android.content.Context;
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import android.graphics.Bitmap;
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import android.graphics.BitmapFactory;
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import android.support.v4.util.LruCache;
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import android.util.Log;
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import android.view.View;
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public class BitmapCache {
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public final static String TAG = "VLC/BitmapCache";
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private final static boolean LOG_ENABLED = false;
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private static BitmapCache mInstance;
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private final LruCache<String, Bitmap> mMemCache;
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public static BitmapCache getInstance() {
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if (mInstance == null)
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mInstance = new BitmapCache();
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return mInstance;
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}
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private BitmapCache() {
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// Get the global context of the application
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Context context = VLCApplication.getAppContext();
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// Get memory class of this device, exceeding this amount will throw an
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// OutOfMemory exception.
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final int memClass = ((ActivityManager) context.getSystemService(
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Context.ACTIVITY_SERVICE)).getMemoryClass();
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// Use 1/5th of the available memory for this memory cache.
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final int cacheSize = 1024 * 1024 * memClass / 5;
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Log.d(TAG, "LRUCache size sets to " + cacheSize);
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mMemCache = new LruCache<String, Bitmap>(cacheSize) {
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@Override
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protected int sizeOf(String key, Bitmap value) {
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return value.getRowBytes() * value.getHeight();
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}
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};
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}
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public Bitmap getBitmapFromMemCache(String key) {
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final Bitmap b = mMemCache.get(key);
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if (LOG_ENABLED)
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Log.d(TAG, (b == null) ? "Cache miss" : "Cache found");
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if (b != null && b.isRecycled()) {
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/* A recycled bitmap cannot be used again */
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mMemCache.remove(key);
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return null;
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}
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return b;
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}
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public void addBitmapToMemCache(String key, Bitmap bitmap) {
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if (key != null && bitmap != null && getBitmapFromMemCache(key) == null)
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mMemCache.put(key, bitmap);
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}
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private Bitmap getBitmapFromMemCache(int resId) {
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return getBitmapFromMemCache("res:" + resId);
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}
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private void addBitmapToMemCache(int resId, Bitmap bitmap) {
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addBitmapToMemCache("res:" + resId, bitmap);
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}
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public void clear() {
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mMemCache.evictAll();
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}
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public static Bitmap GetFromResource(View v, int resId) {
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BitmapCache cache = BitmapCache.getInstance();
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Bitmap bitmap = cache.getBitmapFromMemCache(resId);
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if (bitmap == null) {
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bitmap = BitmapFactory.decodeResource(v.getResources(), resId);
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cache.addBitmapToMemCache(resId, bitmap);
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}
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return bitmap;
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}
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}
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