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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 // | 4 // |
5 // Class for finding and caching Windows explorer icons. The IconManager | 5 // Class for finding and caching Windows explorer icons. The IconManager |
6 // lives on the UI thread but performs icon extraction work on the file thread | 6 // lives on the UI thread but performs icon extraction work on the file thread |
7 // to avoid blocking the UI thread with potentially expensive COM and disk | 7 // to avoid blocking the UI thread with potentially expensive COM and disk |
8 // operations. | 8 // operations. |
9 // | 9 // |
10 // Terminology | 10 // Terminology |
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48 #include <map> | 48 #include <map> |
49 | 49 |
50 #include "base/files/file_path.h" | 50 #include "base/files/file_path.h" |
51 #include "base/task/cancelable_task_tracker.h" | 51 #include "base/task/cancelable_task_tracker.h" |
52 #include "chrome/browser/icon_loader.h" | 52 #include "chrome/browser/icon_loader.h" |
53 #include "ui/gfx/image/image.h" | 53 #include "ui/gfx/image/image.h" |
54 | 54 |
55 class IconManager : public IconLoader::Delegate { | 55 class IconManager : public IconLoader::Delegate { |
56 public: | 56 public: |
57 IconManager(); | 57 IconManager(); |
58 virtual ~IconManager(); | 58 ~IconManager() override; |
59 | 59 |
60 // Synchronous call to examine the internal caches for the icon. Returns the | 60 // Synchronous call to examine the internal caches for the icon. Returns the |
61 // icon if we have already loaded it, NULL if we don't have it and must load | 61 // icon if we have already loaded it, NULL if we don't have it and must load |
62 // it via 'LoadIcon'. The returned bitmap is owned by the IconManager and must | 62 // it via 'LoadIcon'. The returned bitmap is owned by the IconManager and must |
63 // not be free'd by the caller. If the caller needs to modify the icon, it | 63 // not be free'd by the caller. If the caller needs to modify the icon, it |
64 // must make a copy and modify the copy. | 64 // must make a copy and modify the copy. |
65 gfx::Image* LookupIconFromFilepath(const base::FilePath& file_name, | 65 gfx::Image* LookupIconFromFilepath(const base::FilePath& file_name, |
66 IconLoader::IconSize size); | 66 IconLoader::IconSize size); |
67 | 67 |
68 typedef base::Callback<void(gfx::Image*)> IconRequestCallback; | 68 typedef base::Callback<void(gfx::Image*)> IconRequestCallback; |
69 | 69 |
70 // Asynchronous call to lookup and return the icon associated with file. The | 70 // Asynchronous call to lookup and return the icon associated with file. The |
71 // work is done on the file thread, with the callbacks running on the thread | 71 // work is done on the file thread, with the callbacks running on the thread |
72 // this function is called. | 72 // this function is called. |
73 // | 73 // |
74 // Note: | 74 // Note: |
75 // 1. This does *not* check the cache. | 75 // 1. This does *not* check the cache. |
76 // 2. The returned bitmap pointer is *not* owned by callback. So callback | 76 // 2. The returned bitmap pointer is *not* owned by callback. So callback |
77 // should never keep it or delete it. | 77 // should never keep it or delete it. |
78 // 3. The gfx::Image pointer passed to the callback may be NULL if decoding | 78 // 3. The gfx::Image pointer passed to the callback may be NULL if decoding |
79 // failed. | 79 // failed. |
80 base::CancelableTaskTracker::TaskId LoadIcon( | 80 base::CancelableTaskTracker::TaskId LoadIcon( |
81 const base::FilePath& file_name, | 81 const base::FilePath& file_name, |
82 IconLoader::IconSize size, | 82 IconLoader::IconSize size, |
83 const IconRequestCallback& callback, | 83 const IconRequestCallback& callback, |
84 base::CancelableTaskTracker* tracker); | 84 base::CancelableTaskTracker* tracker); |
85 | 85 |
86 // IconLoader::Delegate interface. | 86 // IconLoader::Delegate interface. |
87 virtual bool OnGroupLoaded(IconLoader* loader, | 87 bool OnGroupLoaded(IconLoader* loader, const IconGroupID& group) override; |
88 const IconGroupID& group) override; | 88 bool OnImageLoaded(IconLoader* loader, |
89 virtual bool OnImageLoaded(IconLoader* loader, | 89 gfx::Image* result, |
90 gfx::Image* result, | 90 const IconGroupID& group) override; |
91 const IconGroupID& group) override; | |
92 | 91 |
93 private: | 92 private: |
94 struct CacheKey { | 93 struct CacheKey { |
95 CacheKey(const IconGroupID& group, IconLoader::IconSize size); | 94 CacheKey(const IconGroupID& group, IconLoader::IconSize size); |
96 | 95 |
97 // Used as a key in the map below, so we need this comparator. | 96 // Used as a key in the map below, so we need this comparator. |
98 bool operator<(const CacheKey &other) const; | 97 bool operator<(const CacheKey &other) const; |
99 | 98 |
100 IconGroupID group; | 99 IconGroupID group; |
101 IconLoader::IconSize size; | 100 IconLoader::IconSize size; |
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112 | 111 |
113 // Asynchronous requests that have not yet been completed. | 112 // Asynchronous requests that have not yet been completed. |
114 struct ClientRequest; | 113 struct ClientRequest; |
115 typedef std::map<IconLoader*, ClientRequest> ClientRequests; | 114 typedef std::map<IconLoader*, ClientRequest> ClientRequests; |
116 ClientRequests requests_; | 115 ClientRequests requests_; |
117 | 116 |
118 DISALLOW_COPY_AND_ASSIGN(IconManager); | 117 DISALLOW_COPY_AND_ASSIGN(IconManager); |
119 }; | 118 }; |
120 | 119 |
121 #endif // CHROME_BROWSER_ICON_MANAGER_H_ | 120 #endif // CHROME_BROWSER_ICON_MANAGER_H_ |
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