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1 // Copyright 2015 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 #ifndef CHROME_BROWSER_MANIFEST_MANIFEST_ICON_DOWNLOADER_H_ | |
6 #define CHROME_BROWSER_MANIFEST_MANIFEST_ICON_DOWNLOADER_H_ | |
7 | |
8 #include <vector> | |
9 | |
10 #include "base/basictypes.h" | |
11 #include "base/callback_forward.h" | |
12 #include "third_party/skia/include/core/SkBitmap.h" | |
13 | |
14 namespace content { | |
15 class WebContents; | |
16 } // namespace content | |
17 | |
18 namespace gfx { | |
19 class Size; | |
20 } // namespace gfx | |
21 | |
22 class GURL; | |
23 | |
24 // Downloads the icon located at icon_url. If the file contains multiple icons | |
mlamouri (slow - plz ping)
2015/08/21 13:34:18
nit: say it's a helper.
Lalit Maganti
2015/08/21 13:45:51
Done.
| |
25 // then it attempts to pick the one closest in size bigger than or | |
26 // equal to ideal_icon_size_in_dp, taking into account the density of the | |
27 // device. If a bigger icon is chosen then, the icon is scaled down to be | |
28 // equal to ideal_icon_size_in_dp. | |
29 class ManifestIconDownloader final { | |
30 public: | |
31 using IconFetchCallback = base::Callback<void(const SkBitmap&)>; | |
32 | |
33 ManifestIconDownloader() = delete; | |
34 ~ManifestIconDownloader() = delete; | |
35 | |
36 // Returns whether the download has started. | |
37 // It will return false if the current context or information do not allow to | |
38 // download the image. | |
39 static bool Download(content::WebContents* web_contents, | |
40 const GURL& icon_url, | |
41 int ideal_icon_size_in_dp, | |
42 const IconFetchCallback& callback); | |
43 | |
44 private: | |
45 // Callback run after the manifest icon downloaded successfully or the | |
46 // download failed. | |
47 static void OnIconFetched(int ideal_icon_size_in_px, | |
48 int minimum_icon_size_in_px, | |
49 const IconFetchCallback& callback, | |
50 int id, | |
51 int http_status_code, | |
52 const GURL& url, | |
53 const std::vector<SkBitmap>& bitmaps, | |
54 const std::vector<gfx::Size>& sizes); | |
55 | |
56 static void ScaleIcon(int ideal_icon_size_in_px, | |
57 const SkBitmap& bitmap, | |
58 const IconFetchCallback& callback); | |
59 | |
60 static int FindClosestBitmapIndex(int ideal_icon_size_in_px, | |
61 int minimum_icon_size_in_px, | |
62 const std::vector<SkBitmap>& bitmaps); | |
63 | |
64 friend class ManifestIconDownloaderTest; | |
65 | |
66 DISALLOW_COPY_AND_ASSIGN(ManifestIconDownloader); | |
67 }; | |
68 | |
69 #endif // CHROME_BROWSER_MANIFEST_MANIFEST_ICON_DOWNLOADER_H_ | |
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