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.common; 18 19 import android.content.Context; 20 import android.content.res.Resources; 21 import android.net.Uri; 22 import android.util.Log; 23 24 import com.android.gallery3d.exif.ExifInterface; 25 26 import java.io.BufferedInputStream; 27 import java.io.IOException; 28 import java.io.InputStream; 29 30 public class BitmapUtils { 31 32 private static final String TAG = "BitmapUtils"; 33 34 // Find the min x that 1 / x >= scale 35 public static int computeSampleSizeLarger(float scale) { 36 int initialSize = (int) Math.floor(1f / scale); 37 if (initialSize <= 1) return 1; 38 39 return initialSize <= 8 40 ? Utils.prevPowerOf2(initialSize) 41 : initialSize / 8 * 8; 42 } 43 44 public static int getRotationFromExif(Context context, Uri uri) { 45 return BitmapUtils.getRotationFromExifHelper(null, 0, context, uri); 46 } 47 48 public static int getRotationFromExif(Resources res, int resId) { 49 return BitmapUtils.getRotationFromExifHelper(res, resId, null, null); 50 } 51 52 private static int getRotationFromExifHelper(Resources res, int resId, Context context, Uri uri) { 53 ExifInterface ei = new ExifInterface(); 54 InputStream is = null; 55 BufferedInputStream bis = null; 56 try { 57 if (uri != null) { 58 is = context.getContentResolver().openInputStream(uri); 59 bis = new BufferedInputStream(is); 60 ei.readExif(bis); 61 } else { 62 is = res.openRawResource(resId); 63 bis = new BufferedInputStream(is); 64 ei.readExif(bis); 65 } 66 Integer ori = ei.getTagIntValue(ExifInterface.TAG_ORIENTATION); 67 if (ori != null) { 68 return ExifInterface.getRotationForOrientationValue(ori.shortValue()); 69 } 70 } catch (IOException e) { 71 Log.w(TAG, "Getting exif data failed", e); 72 } catch (NullPointerException e) { 73 // Sometimes the ExifInterface has an internal NPE if Exif data isn't valid 74 Log.w(TAG, "Getting exif data failed", e); 75 } finally { 76 Utils.closeSilently(bis); 77 Utils.closeSilently(is); 78 } 79 return 0; 80 } 81 } 82
