1 /* 2 * Copyright (C) 2013 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.photos; 18 19 import android.graphics.Bitmap; 20 import android.graphics.BitmapFactory; 21 import android.graphics.BitmapRegionDecoder; 22 import android.graphics.Rect; 23 import android.util.Log; 24 import com.android.photos.views.TiledImageRenderer; 25 26 import java.io.IOException; 27 28 public class BitmapRegionTileSource implements TiledImageRenderer.TileSource { 29 30 BitmapRegionDecoder mDecoder; 31 32 33 public BitmapRegionTileSource(String path) { 34 try { 35 mDecoder = BitmapRegionDecoder.newInstance(path, true); 36 } catch (IOException e) { 37 Log.w("BitmapRegionTileSource", "ctor failed", e); 38 } 39 } 40 41 @Override 42 public int getTileSize() { 43 return 256; 44 } 45 46 @Override 47 public int getImageWidth() { 48 return mDecoder.getWidth(); 49 } 50 51 @Override 52 public int getImageHeight() { 53 return mDecoder.getHeight(); 54 } 55 56 @Override 57 public Bitmap getTile(int level, int x, int y, Bitmap bitmap) { 58 int tileSize = getTileSize(); 59 int t = tileSize << level; 60 61 Rect wantRegion = new Rect(x, y, x + t, y + t); 62 63 if (bitmap == null) { 64 bitmap = Bitmap.createBitmap(tileSize, tileSize, Bitmap.Config.ARGB_8888); 65 } 66 67 BitmapFactory.Options options = new BitmapFactory.Options(); 68 options.inPreferredConfig = Bitmap.Config.ARGB_8888; 69 options.inPreferQualityOverSpeed = true; 70 options.inSampleSize = (1 << level); 71 options.inBitmap = bitmap; 72 73 try { 74 // In CropImage, we may call the decodeRegion() concurrently. 75 bitmap = mDecoder.decodeRegion(wantRegion, options); 76 } finally { 77 if (options.inBitmap != bitmap && options.inBitmap != null) { 78 options.inBitmap = null; 79 } 80 } 81 82 if (bitmap == null) { 83 Log.w("BitmapRegionTileSource", "fail in decoding region"); 84 } 85 return bitmap; 86 } 87 } 88
