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/*
* Copyright (C) 2013 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.photos.data;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.util.Log;
import android.util.Pools.Pool;
import android.util.Pools.SynchronizedPool;
import com.android.gallery3d.common.Utils;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
/**
* BitmapDecoder keeps a pool of temporary storage to reuse for decoding
* bitmaps. It also simplifies the multi-stage decoding required to efficiently
* use GalleryBitmapPool. The static methods decode and decodeFile can be used
* to decode a bitmap from GalleryBitmapPool. The bitmap may be returned
* directly to GalleryBitmapPool or use the put method here when the bitmap is
* ready to be recycled.
*/
public class BitmapDecoder {
private static final String TAG = BitmapDecoder.class.getSimpleName();
private static final int POOL_SIZE = 4;
private static final int TEMP_STORAGE_SIZE_BYTES = 16 * 1024;
private static final int HEADER_MAX_SIZE = 128 * 1024;
private static final Pool<BitmapFactory.Options> sOptions =
new SynchronizedPool<BitmapFactory.Options>(POOL_SIZE);
public static Bitmap decode(InputStream in) {
BitmapFactory.Options opts = getOptions();
try {
if (!in.markSupported()) {
in = new BufferedInputStream(in);
}
opts.inJustDecodeBounds = true;
in.mark(HEADER_MAX_SIZE);
BitmapFactory.decodeStream(in, null, opts);
in.reset();
opts.inJustDecodeBounds = false;
GalleryBitmapPool pool = GalleryBitmapPool.getInstance();
Bitmap reuseBitmap = pool.get(opts.outWidth, opts.outHeight);
opts.inBitmap = reuseBitmap;
Bitmap decodedBitmap = BitmapFactory.decodeStream(in, null, opts);
if (reuseBitmap != null && decodedBitmap != reuseBitmap) {
pool.put(reuseBitmap);
}
return decodedBitmap;
} catch (IOException e) {
Log.e(TAG, "Could not decode stream to bitmap", e);
return null;
} finally {
Utils.closeSilently(in);
release(opts);
}
}
public static Bitmap decode(File in) {
return decodeFile(in.toString());
}
public static Bitmap decodeFile(String in) {
BitmapFactory.Options opts = getOptions();
try {
opts.inJustDecodeBounds = true;
BitmapFactory.decodeFile(in, opts);
opts.inJustDecodeBounds = false;
GalleryBitmapPool pool = GalleryBitmapPool.getInstance();
Bitmap reuseBitmap = pool.get(opts.outWidth, opts.outHeight);
opts.inBitmap = reuseBitmap;
Bitmap decodedBitmap = BitmapFactory.decodeFile(in, opts);
if (reuseBitmap != null && decodedBitmap != reuseBitmap) {
pool.put(reuseBitmap);
}
return decodedBitmap;
} finally {
release(opts);
}
}
public static void put(Bitmap bitmap) {
GalleryBitmapPool.getInstance().put(bitmap);
}
private static BitmapFactory.Options getOptions() {
BitmapFactory.Options opts = sOptions.acquire();
if (opts == null) {
opts = new BitmapFactory.Options();
opts.inMutable = true;
opts.inPreferredConfig = Config.ARGB_8888;
opts.inSampleSize = 1;
opts.inTempStorage = new byte[TEMP_STORAGE_SIZE_BYTES];
}
return opts;
}
private static void release(BitmapFactory.Options opts) {
opts.inBitmap = null;
opts.inJustDecodeBounds = false;
sOptions.release(opts);
}
}
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