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Side by Side Diff: chrome/browser/extensions/extension_icon_image.h

Issue 10825012: chromeos: Fix pixelated icons in app list and launcher (part 2) (by xiyuan) (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: . Created 8 years, 4 months ago
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1 // Copyright (c) 2012 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_EXTENSIONS_EXTENSION_ICON_IMAGE_H_
6 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_ICON_IMAGE_H_
7
8 #include <map>
9 #include <string>
10
11 #include "base/basictypes.h"
12 #include "chrome/browser/extensions/image_loading_tracker.h"
13 #include "chrome/common/extensions/extension_icon_set.h"
14 #include "content/public/browser/notification_observer.h"
15 #include "content/public/browser/notification_registrar.h"
16 #include "ui/gfx/image/image_skia.h"
17
18 namespace extensions {
19 class Extension;
20 }
21
22 namespace gfx {
23 class Size;
24 }
25
26 namespace extensions {
27
28 // A class that provides an ImageSkia for UI code to use. It handles extension
29 // icon resource loading, screen scale factor change etc. UI code that uses
30 // extension icon should host this class and be its observer. ExtensionIconImage
31 // should be outlived by the observer. In painting code, UI code paints with the
32 // ImageSkia provided by this class. If required extension icon resource is not
33 // present, this class uses ImageLoadingTracker to load it and call on its
34 // observer interface when the resource is loaded.
35 class IconImage : public ImageLoadingTracker::Observer,
36 public content::NotificationObserver {
37 public:
38 class Observer {
39 public:
40 // Invoked when a new image rep for an additional scale factor
41 // is loaded and added to |image|.
42 virtual void OnExtensionIconImageChanged(IconImage* image) = 0;
43
44 // Invoked when the icon image couldn't be loaded.
45 virtual void OnIconImageLoadFailed(IconImage* image,
46 ui::ScaleFactor scale_factor) = 0;
47
48 protected:
49 virtual ~Observer() {}
50 };
51
52 IconImage(const Extension* extension,
53 const ExtensionIconSet& icon_set,
54 int resource_size_in_dip,
55 Observer* observer);
56 virtual ~IconImage();
57
58 const gfx::ImageSkia& image_skia() const { return image_skia_; }
59
60 private:
61 class Source;
62
63 typedef std::map<int, ui::ScaleFactor> LoadMap;
64
65 // Loads bitmap for additional scale factor.
66 void LoadImageForScaleFactor(ui::ScaleFactor scale_factor);
67
68 // ImageLoadingTracker::Observer overrides:
69 virtual void OnImageLoaded(const gfx::Image& image,
70 const std::string& extension_id,
71 int index) OVERRIDE;
72
73 // content::NotificationObserver overrides:
74 virtual void Observe(int type,
75 const content::NotificationSource& source,
76 const content::NotificationDetails& details) OVERRIDE;
77
78 const Extension* extension_;
79 const ExtensionIconSet& icon_set_;
80 const int resource_size_in_dip_;
81 const gfx::Size desired_size_in_dip_;
82
83 Observer* observer_;
84
85 Source* source_; // Owned by ImageSkia storage.
86 gfx::ImageSkia image_skia_;
87
88 ImageLoadingTracker tracker_;
89 content::NotificationRegistrar registrar_;
90
91 LoadMap load_map_;
92
93 DISALLOW_COPY_AND_ASSIGN(IconImage);
94 };
95
96 } // namespace extensions
97
98 #endif // CHROME_BROWSER_EXTENSIONS_EXTENSION_ICON_IMAGE_H_
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