package fr.bamlab.rnimageresizer;
import android.content.Context;
import android.content.ContentResolver;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.BitmapRegionDecoder;
import android.graphics.Matrix;
import android.media.ExifInterface;
import android.net.Uri;
import android.provider.MediaStore;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.util.Base64;
import android.util.Pair;
import java.io.Closeable;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.io.IOException;
import java.util.Date;
/**
* Provide methods to resize and rotate an image file.
*/
class ImageResizer {
private final static String BASE64_PREFIX = "data:image/";
/**
* Resize the specified bitmap, keeping its aspect ratio.
*/
private static Bitmap resizeImage(Bitmap image, int maxWidth, int maxHeight) {
Bitmap newImage = null;
if (image == null) {
return null; // Can't load the image from the given path.
}
if (maxHeight > 0 && maxWidth > 0) {
float width = image.getWidth();
float height = image.getHeight();
float ratio = Math.min((float)maxWidth / width, (float)maxHeight / height);
int finalWidth = (int) (width * ratio);
int finalHeight = (int) (height * ratio);
newImage = Bitmap.createScaledBitmap(image, finalWidth, finalHeight, true);
}
return newImage;
}
/**
* Rotate the specified bitmap with the given angle, in degrees.
*/
public static Bitmap rotateImage(Bitmap source, float angle)
{
Bitmap retVal;
Matrix matrix = new Matrix();
matrix.postRotate(angle);
retVal = Bitmap.createBitmap(source, 0, 0, source.getWidth(), source.getHeight(), matrix, true);
return retVal;
}
/**
* Save the given bitmap in a directory. Extension is automatically generated using the bitmap format.
*/
private static String saveImage(Bitmap bitmap, File saveDirectory, String fileName,
Bitmap.CompressFormat compressFormat, int quality)
throws IOException {
if (bitmap == null) {
throw new IOException("The bitmap couldn't be resized");
}
File newFile = new File(saveDirectory, fileName + "." + compressFormat.name());
if(!newFile.createNewFile()) {
throw new IOException("The file already exists");
}
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
bitmap.compress(compressFormat, quality, outputStream);
byte[] bitmapData = outputStream.toByteArray();
outputStream.flush();
outputStream.close();
FileOutputStream fos = new FileOutputStream(newFile);
fos.write(bitmapData);
fos.flush();
fos.close();
return newFile.getAbsolutePath();
}
/**
* Get {@link File} object for the given Android URI.<br>
* Use content resolver to get real path if direct path doesn't return valid file.
*/
private static File getFileFromUri(Context context, Uri uri) {
// first try by direct path
File file = new File(uri.getPath());
if (file.exists()) {
return file;
}
// try reading real path from content resolver (gallery images)
Cursor cursor = null;
try {
String[] proj = {MediaStore.Images.Media.DATA};
cursor = context.getContentResolver().query(uri, proj, null, null, null);
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
String realPath = cursor.getString(column_index);
file = new File(realPath);
} catch (Exception ignored) {
} finally {
if (cursor != null) {
cursor.close();
}
}
return file;
}
/**
* Get orientation by reading Image metadata
*/
public static int getOrientation(Context context, Uri uri) {
try {
File file = getFileFromUri(context, uri);
if (file.exists()) {
ExifInterface ei = new ExifInterface(file.getAbsolutePath());
return getOrientation(ei);
}
} catch (Exception ignored) { }
return 0;
}
/**
* Convert metadata to degrees
*/
public static int getOrientation(ExifInterface exif) {
int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);
switch (orientation) {
case ExifInterface.ORIENTATION_ROTATE_90:
return 90;
case ExifInterface.ORIENTATION_ROTATE_180:
return 180;
case ExifInterface.ORIENTATION_ROTATE_270:
return 270;
default:
return 0;
}
}
/**
* Compute the inSampleSize value to use to load a bitmap.
* Adapted from https://developer.android.com/training/displaying-bitmaps/load-bitmap.html
*/
private static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
final int halfHeight = height / 2;
final int halfWidth = width / 2;
// Calculate the largest inSampleSize value that is a power of 2 and keeps both
// height and width larger than the requested height and width.
while ((halfHeight / inSampleSize) >= reqHeight && (halfWidth / inSampleSize) >= reqWidth) {
inSampleSize *= 2;
}
}
return inSampleSize;
}
/**
* Load a bitmap either from a real file or using the {@link ContentResolver} of the current
* {@link Context} (to read gallery images for example).
*/
private static Bitmap loadBitmap(Context context, String imagePath, BitmapFactory.Options options) throws IOException {
Bitmap sourceImage = null;
if (!imagePath.startsWith("content://") && !imagePath.startsWith("file://")) {
sourceImage = BitmapFactory.decodeFile(imagePath, options);
} else {
ContentResolver cr = context.getContentResolver();
InputStream input = cr.openInputStream(Uri.parse(imagePath));
if (input != null) {
sourceImage = BitmapFactory.decodeStream(input, null, options);
input.close();
}
}
return sourceImage;
}
/**
* Loads the bitmap resource from the file specified in imagePath.
*/
private static Bitmap loadBitmapFromFile(Context context, String imagePath, int newWidth,
int newHeight) throws IOException {
// Decode the image bounds to find the size of the source image.
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
loadBitmap(context, imagePath, options);
// Set a sample size according to the image size to lower memory usage.
options.inSampleSize = calculateInSampleSize(options, newWidth, newHeight);
options.inJustDecodeBounds = false;
System.out.println(options.inSampleSize);
return loadBitmap(context, imagePath, options);
}
/**
* Loads the bitmap resource from a base64 encoded jpg or png.
* Format is as such:
* png: 'data:image/png;base64,iVBORw0KGgoAA...'
* jpg: 'data:image/jpeg;base64,/9j/4AAQSkZJ...'
*/
private static Bitmap loadBitmapFromBase64(String imagePath) {
Bitmap sourceImage = null;
// base64 image. Convert to a bitmap.
final int prefixLen = BASE64_PREFIX.length();
final boolean isJpeg = (imagePath.indexOf("jpeg") == prefixLen);
final boolean isPng = (!isJpeg) && (imagePath.indexOf("png") == prefixLen);
int commaLocation = -1;
if (isJpeg || isPng){
commaLocation = imagePath.indexOf(',');
}
if (commaLocation > 0) {
final String encodedImage = imagePath.substring(commaLocation+1);
final byte[] decodedString = Base64.decode(encodedImage, Base64.DEFAULT);
sourceImage = BitmapFactory.decodeByteArray(decodedString, 0, decodedString.length);
}
return sourceImage;
}
/**
* Create a resized version of the given image.
*/
public static String createResizedImage(Context context, String imagePath, int newWidth,
int newHeight, Bitmap.CompressFormat compressFormat,
int quality, int rotation, String outputPath) throws IOException {
Bitmap sourceImage = null;
// If the BASE64_PREFIX is absent, load bitmap from a file. Otherwise, load from base64.
if (imagePath.indexOf(BASE64_PREFIX) < 0) {
sourceImage = ImageResizer.loadBitmapFromFile(context, imagePath, newWidth, newHeight);
}
else {
sourceImage = ImageResizer.loadBitmapFromBase64(imagePath);
}
if (sourceImage == null){
return "";
}
// Scale it first so there are fewer pixels to transform in the rotation
Bitmap scaledImage = ImageResizer.resizeImage(sourceImage, newWidth, newHeight);
if (sourceImage != scaledImage) {
sourceImage.recycle();
}
// Rotate if necessary
Bitmap rotatedImage = scaledImage;
int orientation = getOrientation(context, Uri.parse(imagePath));
rotation = orientation + rotation;
rotatedImage = ImageResizer.rotateImage(scaledImage, rotation);
if (scaledImage != rotatedImage) {
scaledImage.recycle();
}
// Save the resulting image
File path = context.getCacheDir();
if (outputPath != null) {
path = new File(outputPath);
}
String resizedImagePath = ImageResizer.saveImage(rotatedImage, path,
Long.toString(new Date().getTime()), compressFormat, quality);
// Clean up remaining image
rotatedImage.recycle();
return resizedImagePath;
}
}
