| /* |
| * 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 = 16 * 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); |
| } |
| } |