/*
* Copyright (C) 2010 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.photoeditor;
import android.content.Context;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.Bitmap.CompressFormat;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.RectF;
import android.net.Uri;
import android.provider.MediaStore.Images.ImageColumns;
import android.util.Log;
import java.io.Closeable;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
/**
* Utils for bitmap operations.
*/
public class BitmapUtils {
private static final String TAG = "BitmapUtils";
private static final int DEFAULT_COMPRESS_QUALITY = 90;
private static final int INDEX_ORIENTATION = 0;
private static final String[] IMAGE_PROJECTION = new String[] {
ImageColumns.ORIENTATION
};
private final Context context;
public BitmapUtils(Context context) {
this.context = context;
}
/**
* Creates a mutable bitmap from subset of source bitmap, transformed by the optional matrix.
*/
private static Bitmap createBitmap(
Bitmap source, int x, int y, int width, int height, Matrix m) {
// Re-implement Bitmap createBitmap() to always return a mutable bitmap.
Canvas canvas = new Canvas();
Bitmap bitmap;
Paint paint;
if ((m == null) || m.isIdentity()) {
bitmap = Bitmap.createBitmap(width, height, source.getConfig());
paint = null;
} else {
RectF rect = new RectF(0, 0, width, height);
m.mapRect(rect);
bitmap = Bitmap.createBitmap(
Math.round(rect.width()), Math.round(rect.height()), source.getConfig());
canvas.translate(-rect.left, -rect.top);
canvas.concat(m);
paint = new Paint(Paint.FILTER_BITMAP_FLAG);
if (!m.rectStaysRect()) {
paint.setAntiAlias(true);
}
}
bitmap.setDensity(source.getDensity());
canvas.setBitmap(bitmap);
Rect srcBounds = new Rect(x, y, x + width, y + height);
RectF dstBounds = new RectF(0, 0, width, height);
canvas.drawBitmap(source, srcBounds, dstBounds, paint);
return bitmap;
}
private void closeStream(Closeable stream) {
if (stream != null) {
try {
stream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
private Rect getBitmapBounds(Uri uri) {
Rect bounds = new Rect();
InputStream is = null;
try {
is = context.getContentResolver().openInputStream(uri);
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeStream(is, null, options);
bounds.right = options.outWidth;
bounds.bottom = options.outHeight;
} catch (FileNotFoundException e) {
e.printStackTrace();
} finally {
closeStream(is);
}
return bounds;
}
private int getOrientation(Uri uri) {
int orientation = 0;
Cursor cursor = null;
try {
cursor = context.getContentResolver().query(uri, IMAGE_PROJECTION, null, null, null);
if ((cursor != null) && cursor.moveToNext()) {
orientation = cursor.getInt(INDEX_ORIENTATION);
}
} catch (Exception e) {
// Ignore error for no orientation column; just use the default orientation value 0.
} finally {
if (cursor != null) {
cursor.close();
}
}
return orientation;
}
/**
* Decodes bitmap (maybe immutable) that keeps aspect-ratio and spans most within the bounds.
*/
private Bitmap decodeBitmap(Uri uri, int width, int height) {
InputStream is = null;
Bitmap bitmap = null;
try {
// TODO: Take max pixels allowed into account for calculation to avoid possible OOM.
Rect bounds = getBitmapBounds(uri);
int sampleSize = Math.max(bounds.width() / width, bounds.height() / height);
sampleSize = Math.min(sampleSize,
Math.max(bounds.width() / height, bounds.height() / width));
BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize = Math.max(sampleSize, 1);
options.inPreferredConfig = Bitmap.Config.ARGB_8888;
is = context.getContentResolver().openInputStream(uri);
bitmap = BitmapFactory.decodeStream(is, null, options);
} catch (FileNotFoundException e) {
Log.e(TAG, "FileNotFoundException: " + uri);
} finally {
closeStream(is);
}
// Ensure bitmap in 8888 format, good for editing as well as GL compatible.
if ((bitmap != null) && (bitmap.getConfig() != Bitmap.Config.ARGB_8888)) {
Bitmap copy = bitmap.copy(Bitmap.Config.ARGB_8888, true);
bitmap.recycle();
bitmap = copy;
}
if (bitmap != null) {
// Scale down the sampled bitmap if it's still larger than the desired dimension.
float scale = Math.min((float) width / bitmap.getWidth(),
(float) height / bitmap.getHeight());
scale = Math.max(scale, Math.min((float) height / bitmap.getWidth(),
(float) width / bitmap.getHeight()));
if (scale < 1) {
Matrix m = new Matrix();
m.setScale(scale, scale);
Bitmap transformed = createBitmap(
bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), m);
bitmap.recycle();
return transformed;
}
}
return bitmap;
}
/**
* Gets decoded bitmap that keeps orientation as well.
*/
public Bitmap getBitmap(Uri uri, int width, int height) {
Bitmap bitmap = decodeBitmap(uri, width, height);
// Rotate the decoded bitmap according to its orientation if it's necessary.
if (bitmap != null) {
int orientation = getOrientation(uri);
if (orientation != 0) {
Matrix m = new Matrix();
m.setRotate(orientation);
Bitmap transformed = createBitmap(
bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), m);
bitmap.recycle();
return transformed;
}
}
return bitmap;
}
/**
* Saves the bitmap by given directory, filename, and format; if the directory is given null,
* then saves it under the cache directory.
*/
public File saveBitmap(
Bitmap bitmap, String directory, String filename, CompressFormat format) {
if (directory == null) {
directory = context.getCacheDir().getAbsolutePath();
} else {
// Check if the given directory exists or try to create it.
File file = new File(directory);
if (!file.isDirectory() && !file.mkdirs()) {
return null;
}
}
File file = null;
OutputStream os = null;
try {
filename = (format == CompressFormat.PNG) ? filename + ".png" : filename + ".jpg";
file = new File(directory, filename);
os = new FileOutputStream(file);
bitmap.compress(format, DEFAULT_COMPRESS_QUALITY, os);
} catch (FileNotFoundException e) {
e.printStackTrace();
} finally {
closeStream(os);
}
return file;
}
}