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/*
* Copyright (C) 2013 The CyanogenMod 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 org.cyanogenmod.wallpapers.photophase;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.BitmapFactory.Options;
import android.graphics.Matrix;
import android.media.ExifInterface;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
/**
* A helper class for deal with Bitmaps
*/
public class BitmapUtils {
/**
* Method that decodes a bitmap
*
* @param bitmap The bitmap buffer to decode
* @return Bitmap The decoded bitmap
*/
public static Bitmap decodeBitmap(InputStream bitmap) {
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inPreferQualityOverSpeed = false;
options.inPreferredConfig = Bitmap.Config.RGB_565;
return BitmapFactory.decodeStream(bitmap, null, options);
}
/**
* Method that decodes a bitmap
*
* @param file The bitmap file to decode
* @param reqWidth The request width
* @param reqHeight The request height
* @return Bitmap The decoded bitmap
*/
public static Bitmap decodeBitmap(File file, int reqWidth, int reqHeight) {
// First decode with inJustDecodeBounds=true to check dimensions
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
options.inPreferQualityOverSpeed = false;
options.inPreferredConfig = Bitmap.Config.RGB_565;
BitmapFactory.decodeFile(file.getAbsolutePath(), options);
// Calculate inSampleSize
options.inSampleSize = calculateBitmapRatio(options, reqWidth, reqHeight);
// Decode the bitmap with inSampleSize set
options.inJustDecodeBounds = false;
Bitmap bitmap = BitmapFactory.decodeFile(file.getAbsolutePath(), options);
if (bitmap == null) {
return null;
}
//Test if the file has exif format
return decodeExifBitmap(file, bitmap);
}
/**
* Method that decodes an Exif bitmap
*
* @param file The file to decode
* @param bitmap The bitmap reference
* @return Bitmap The decoded bitmap
*/
private static Bitmap decodeExifBitmap(File file, Bitmap bitmap) {
try {
// Try to load the bitmap as a bitmap file
ExifInterface exif = new ExifInterface(file.getAbsolutePath());
int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, 1);
Matrix matrix = new Matrix();
if (orientation == 6) {
matrix.postRotate(90);
} else if (orientation == 3) {
matrix.postRotate(180);
} else if (orientation == 8) {
matrix.postRotate(270);
}
// Rotate the bitmap
return Bitmap.createBitmap(
bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
} catch (IOException e) {
// Ignore
}
return bitmap;
}
/**
* Method that calculate the bitmap size prior to decode
*
* @param options The bitmap factory options
* @param reqWidth The request width
* @param reqHeight The request height
* @return int The picture ratio
*/
private static int calculateBitmapRatio(Options options, int reqWidth, int reqHeight) {
// Raw height and width of image
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
// Calculate ratios of height and width to requested height and width
final int heightRatio = Math.round((float) height / (float) reqHeight);
final int widthRatio = Math.round((float) width / (float) reqWidth);
// Choose the smallest ratio as inSampleSize value, this will guarantee
// a final image with both dimensions larger than or equal to the
// requested height and width.
inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
}
return inSampleSize;
}
}
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