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1 // Copyright 2017 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 package org.chromium.chrome.browser.photo_picker; | |
6 | |
7 import android.graphics.Bitmap; | |
8 import android.os.AsyncTask; | |
9 import android.util.LruCache; | |
10 | |
11 import org.chromium.base.ThreadUtils; | |
12 | |
13 /** | |
14 * A worker task to enumerate image files on disk. | |
15 */ | |
16 class BitmapScalerWorkerTask extends AsyncTask<Void, Void, Bitmap> { | |
Michael van Ouwerkerk
2017/05/08 13:14:48
nit: BitmapScalerTask seems cleaner.
| |
17 private final LruCache<String, Bitmap> mCache; | |
18 private final Bitmap mBitmap; | |
19 private final String mFilePath; | |
20 private final int mSize; | |
21 | |
22 /** | |
23 * A BitmapScalerWorkerTask constructor. | |
24 */ | |
25 public BitmapScalerWorkerTask( | |
26 LruCache<String, Bitmap> cache, String filePath, Bitmap bitmap, int size) { | |
27 mCache = cache; | |
28 mBitmap = bitmap; | |
Michael van Ouwerkerk
2017/05/08 13:14:48
nit: you could make this the execution input param
| |
29 mFilePath = filePath; | |
30 mSize = size; | |
31 } | |
32 | |
33 /** | |
34 * Enumerates (in the background) the image files on disk. Called on a non-U I thread | |
35 * @param params Ignored, do not use. | |
36 * @return A sorted list of images (by last-modified first). | |
37 */ | |
38 @Override | |
39 protected Bitmap doInBackground(Void... params) { | |
40 assert !ThreadUtils.runningOnUiThread(); | |
41 | |
42 if (isCancelled()) return null; | |
43 | |
44 return BitmapUtils.scale(mBitmap, mSize, false); | |
45 } | |
46 | |
47 /** | |
48 * Communicates the results back to the client. Called on the UI thread. | |
49 * @param result The resulting scaled bitmap | |
50 */ | |
51 @Override | |
52 protected void onPostExecute(Bitmap result) { | |
53 if (isCancelled()) { | |
54 return; | |
55 } | |
56 | |
57 mCache.put(mFilePath, result); | |
58 } | |
59 } | |
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