1 /* 2 * Copyright (C) 2011 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.data; 18 19 import android.util.Log; 20 21 import com.android.gallery3d.exif.ExifInterface; 22 23 import java.io.IOException; 24 import java.io.InputStream; 25 26 public class Exif { 27 private static final String TAG = "GalleryExif"; 28 29 /** 30 * Returns the degrees in clockwise. Values are 0, 90, 180, or 270. 31 */ 32 public static int getOrientation(InputStream is) { 33 if (is == null) { 34 return 0; 35 } 36 ExifInterface exif = new ExifInterface(); 37 try { 38 exif.readExif(is); 39 Integer val = exif.getTagIntValue(ExifInterface.TAG_ORIENTATION); 40 if (val == null) { 41 return 0; 42 } else { 43 return ExifInterface.getRotationForOrientationValue(val.shortValue()); 44 } 45 } catch (IOException e) { 46 Log.w(TAG, "Failed to read EXIF orientation", e); 47 return 0; 48 } 49 } 50 51 /** 52 * Returns an exif interface instance for the given JPEG image. 53 * 54 * @param jpegData a valid JPEG image containing EXIF data 55 */ 56 public static ExifInterface getExif(byte[] jpegData) { 57 ExifInterface exif = new ExifInterface(); 58 try { 59 exif.readExif(jpegData); 60 } catch (IOException e) { 61 Log.w(TAG, "Failed to read EXIF data", e); 62 } 63 return exif; 64 } 65 66 /** 67 * Returns the degrees in clockwise. Values are 0, 90, 180, or 270. 68 */ 69 public static int getOrientation(ExifInterface exif) { 70 Integer val = exif.getTagIntValue(ExifInterface.TAG_ORIENTATION); 71 if (val == null) { 72 return 0; 73 } else { 74 return ExifInterface.getRotationForOrientationValue(val.shortValue()); 75 } 76 } 77 78 /** 79 * See {@link #getOrientation(byte[])}, but using the picture bytes instead. 80 */ 81 public static int getOrientation(byte[] jpegData) { 82 if (jpegData == null) 83 return 0; 84 85 ExifInterface exif = getExif(jpegData); 86 return getOrientation(exif); 87 } 88 } 89
