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 BitmapTileProvider(Bitmap bitmap, int maxBackupSize)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 getScreenNail()54 public ScreenNail getScreenNail() { 55 return mScreenNail; 56 } 57 58 @Override getImageHeight()59 public int getImageHeight() { 60 return mImageHeight; 61 } 62 63 @Override getImageWidth()64 public int getImageWidth() { 65 return mImageWidth; 66 } 67 68 @Override getLevelCount()69 public int getLevelCount() { 70 return mMipmaps.length; 71 } 72 73 @Override getTile(int level, int x, int y, int tileSize, int borderSize, BitmapPool pool)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 recycle()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