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      1 /*
      2  * Copyright (C) 2010 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.ui;
     18 
     19 import android.graphics.Bitmap;
     20 import android.graphics.Bitmap.Config;
     21 import android.graphics.Canvas;
     22 
     23 import com.android.gallery3d.common.BitmapUtils;
     24 import com.android.gallery3d.data.BitmapPool;
     25 
     26 import java.util.ArrayList;
     27 
     28 public class BitmapTileProvider implements TileImageView.Model {
     29     private final ScreenNail mScreenNail;
     30     private final Bitmap[] mMipmaps;
     31     private final Config mConfig;
     32     private final int mImageWidth;
     33     private final int mImageHeight;
     34 
     35     private boolean mRecycled = false;
     36 
     37     public BitmapTileProvider(Bitmap bitmap, int maxBackupSize) {
     38         mImageWidth = bitmap.getWidth();
     39         mImageHeight = bitmap.getHeight();
     40         ArrayList<Bitmap> list = new ArrayList<Bitmap>();
     41         list.add(bitmap);
     42         while (bitmap.getWidth() > maxBackupSize
     43                 || bitmap.getHeight() > maxBackupSize) {
     44             bitmap = BitmapUtils.resizeBitmapByScale(bitmap, 0.5f, false);
     45             list.add(bitmap);
     46         }
     47 
     48         mScreenNail = new BitmapScreenNail(list.remove(list.size() - 1));
     49         mMipmaps = list.toArray(new Bitmap[list.size()]);
     50         mConfig = Config.ARGB_8888;
     51     }
     52 
     53     @Override
     54     public ScreenNail getScreenNail() {
     55         return mScreenNail;
     56     }
     57 
     58     @Override
     59     public int getImageHeight() {
     60         return mImageHeight;
     61     }
     62 
     63     @Override
     64     public int getImageWidth() {
     65         return mImageWidth;
     66     }
     67 
     68     @Override
     69     public int getLevelCount() {
     70         return mMipmaps.length;
     71     }
     72 
     73     @Override
     74     public Bitmap getTile(int level, int x, int y, int tileSize,
     75             int borderSize, BitmapPool pool) {
     76         x >>= level;
     77         y >>= level;
     78         int size = tileSize + 2 * borderSize;
     79 
     80         Bitmap result = pool == null ? null : pool.getBitmap();
     81         if (result == null) {
     82             result = Bitmap.createBitmap(size, size, mConfig);
     83         } else {
     84             result.eraseColor(0);
     85         }
     86 
     87         Bitmap mipmap = mMipmaps[level];
     88         Canvas canvas = new Canvas(result);
     89         int offsetX = -x + borderSize;
     90         int offsetY = -y + borderSize;
     91         canvas.drawBitmap(mipmap, offsetX, offsetY, null);
     92         return result;
     93     }
     94 
     95     public void recycle() {
     96         if (mRecycled) return;
     97         mRecycled = true;
     98         for (Bitmap bitmap : mMipmaps) {
     99             BitmapUtils.recycleSilently(bitmap);
    100         }
    101         if (mScreenNail != null) {
    102             mScreenNail.recycle();
    103         }
    104     }
    105 }
    106