Exif.java

/*
 * 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.fastergallery.data;

import android.util.Log;

import com.android.fastergallery.exif.ExifInterface;

import java.io.IOException;
import java.io.InputStream;

public class Exif {
	private static final String TAG = "CameraExif";

	// 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;
		}
	}
}