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      1 /*
      2  * Copyright (C) 2014 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.tv.settings.widget;
     18 
     19 import android.graphics.Bitmap;
     20 import android.util.Log;
     21 import android.util.SparseArray;
     22 
     23 import java.lang.ref.SoftReference;
     24 import java.lang.reflect.InvocationTargetException;
     25 import java.lang.reflect.Method;
     26 import java.util.ArrayList;
     27 
     28 // FIXME: this class saves recycle bitmap as SoftReference,  which is too vulnerable to
     29 // be garbage collected due to other part of application is re-allocating lots of
     30 // memory,  we will lose all SoftReference in a GC run.  We should maintain
     31 // certain amount of recycled bitmaps in memory, we may also need remove bitmap from LRUCache
     32 // if we are not able to get a recycled bitmap here.
     33 public class RecycleBitmapPool {
     34 
     35     private static final String TAG = "RecycleBitmapPool";
     36     private static final boolean DEBUG = false;
     37     // allow reuse bitmap with larger bytes, set to 0 to disable different byte size
     38     // FIXME: wait b/10608305 to be fixed then turn back on
     39     private static final int LARGER_BITMAP_ALLOWED_REUSE = 0;
     40     private static final boolean LARGER_BITMAP_ALLOWED = LARGER_BITMAP_ALLOWED_REUSE > 0;
     41 
     42     private static Method sGetAllocationByteCount;
     43 
     44     static {
     45         try {
     46             // KLP or later
     47             sGetAllocationByteCount = Bitmap.class.getMethod("getAllocationByteCount");
     48         } catch (NoSuchMethodException e) {
     49         }
     50     }
     51 
     52     private final SparseArray<ArrayList<SoftReference<Bitmap>>> mRecycled8888 =
     53             new SparseArray<ArrayList<SoftReference<Bitmap>>>();
     54 
     55     public RecycleBitmapPool() {
     56     }
     57 
     58     public static int getSize(Bitmap bitmap) {
     59         if (sGetAllocationByteCount != null) {
     60             try {
     61                 return (Integer) sGetAllocationByteCount.invoke(bitmap);
     62             } catch (IllegalArgumentException e) {
     63                 Log.e(TAG, "getAllocationByteCount() failed", e);
     64             } catch (IllegalAccessException e) {
     65                 Log.e(TAG, "getAllocationByteCount() failed", e);
     66             } catch (InvocationTargetException e) {
     67                 Log.e(TAG, "getAllocationByteCount() failed", e);
     68             }
     69             sGetAllocationByteCount = null;
     70         }
     71         return bitmap.getByteCount();
     72     }
     73 
     74     private static int getSize(int width, int height) {
     75         if (width >= 2048 || height >= 2048) {
     76             return 0;
     77         }
     78         return width * height * 4;
     79     }
     80 
     81     public void addRecycledBitmap(Bitmap bitmap) {
     82         if (bitmap.isRecycled()) {
     83             return;
     84         }
     85         Bitmap.Config config = bitmap.getConfig();
     86         if (config != Bitmap.Config.ARGB_8888) {
     87             return;
     88         }
     89         int key = getSize(bitmap);
     90         if (key == 0) {
     91             return;
     92         }
     93         synchronized (mRecycled8888) {
     94             ArrayList<SoftReference<Bitmap>> list = mRecycled8888.get(key);
     95             if (list == null) {
     96                 list = new ArrayList<SoftReference<Bitmap>>();
     97                 mRecycled8888.put(key, list);
     98             }
     99             list.add(new SoftReference<Bitmap>(bitmap));
    100             if (DEBUG) {
    101                 Log.d(TAG, list.size() + " add bitmap " + bitmap.getWidth() + " "
    102                         + bitmap.getHeight());
    103             }
    104         }
    105     }
    106 
    107     public Bitmap getRecycledBitmap(int width, int height) {
    108         int key = getSize(width, height);
    109         if (key == 0) {
    110             return null;
    111         }
    112         synchronized (mRecycled8888) {
    113             // for the new version with getAllocationByteCount(), we allow larger size
    114             // to be reused for the bitmap,  otherwise we just looks for same size
    115             Bitmap bitmap = getRecycledBitmap(mRecycled8888.get(key));
    116             if (sGetAllocationByteCount == null || bitmap != null) {
    117                 return bitmap;
    118             }
    119             if (LARGER_BITMAP_ALLOWED) {
    120                 for (int i = 0, c = mRecycled8888.size(); i < c; i++) {
    121                     int k = mRecycled8888.keyAt(i);
    122                     if (k > key && k <= key * LARGER_BITMAP_ALLOWED_REUSE) {
    123                         bitmap = getRecycledBitmap(mRecycled8888.valueAt(i));
    124                         if (bitmap != null) {
    125                             return bitmap;
    126                         }
    127                     }
    128                 }
    129             }
    130         }
    131         if (DEBUG) {
    132             Log.d(TAG, "not avaialbe for " + width + "," + height);
    133         }
    134         return null;
    135     }
    136 
    137     private static Bitmap getRecycledBitmap(ArrayList<SoftReference<Bitmap>> list) {
    138         if (list != null && !list.isEmpty()) {
    139             while (!list.isEmpty()) {
    140                 SoftReference<Bitmap> ref = list.remove(list.size() - 1);
    141                 Bitmap bitmap = ref.get();
    142                 if (bitmap != null && !bitmap.isRecycled()) {
    143                     if (DEBUG) {
    144                         Log.d(TAG, "reuse " + bitmap.getWidth() + " " + bitmap.getHeight());
    145                     }
    146                     return bitmap;
    147                 } else {
    148                     if (DEBUG) {
    149                         Log.d(TAG, " we lost SoftReference to bitmap");
    150                     }
    151                 }
    152             }
    153         }
    154         return null;
    155     }
    156 }
    157