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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.gallery3d.data;
import android.util.Log;
import com.android.gallery3d.exif.ExifInterface;
import java.io.IOException;
import java.io.InputStream;
public class Exif {
private static final String TAG = "GalleryExif";
/**
* Returns the degrees in clockwise. Values are 0, 90, 180, or 270.
*/
public static int getOrientation(InputStream is) {
if (is == null) {
return 0;
}
ExifInterface exif = new ExifInterface();
try {
exif.readExif(is);
Integer val = exif.getTagIntValue(ExifInterface.TAG_ORIENTATION);
if (val == null) {
return 0;
} else {
return ExifInterface.getRotationForOrientationValue(val.shortValue());
}
} catch (IOException e) {
Log.w(TAG, "Failed to read EXIF orientation", e);
return 0;
}
}
/**
* Returns an exif interface instance for the given JPEG image.
*
* @param jpegData a valid JPEG image containing EXIF data
*/
public static ExifInterface getExif(byte[] jpegData) {
ExifInterface exif = new ExifInterface();
try {
exif.readExif(jpegData);
} catch (IOException e) {
Log.w(TAG, "Failed to read EXIF data", e);
}
return exif;
}
/**
* Returns the degrees in clockwise. Values are 0, 90, 180, or 270.
*/
public static int getOrientation(ExifInterface exif) {
Integer val = exif.getTagIntValue(ExifInterface.TAG_ORIENTATION);
if (val == null) {
return 0;
} else {
return ExifInterface.getRotationForOrientationValue(val.shortValue());
}
}
/**
* See {@link #getOrientation(byte[])}, but using the picture bytes instead.
*/
public static int getOrientation(byte[] jpegData) {
if (jpegData == null)
return 0;
ExifInterface exif = getExif(jpegData);
return getOrientation(exif);
}
}
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