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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 #ifndef CONTENT_RENDERER_HYPHENATOR_HYPHENATOR_H_ | 5 #ifndef CONTENT_RENDERER_HYPHENATOR_HYPHENATOR_H_ |
6 #define CONTENT_RENDERER_HYPHENATOR_HYPHENATOR_H_ | 6 #define CONTENT_RENDERER_HYPHENATOR_HYPHENATOR_H_ |
7 | 7 |
8 #include <vector> | 8 #include <vector> |
9 | 9 |
10 #include "base/memory/scoped_ptr.h" | 10 #include "base/memory/scoped_handle.h" |
11 #include "base/platform_file.h" | 11 #include "base/platform_file.h" |
12 #include "base/string16.h" | 12 #include "base/string16.h" |
13 #include "content/common/content_export.h" | 13 #include "content/common/content_export.h" |
14 #include "content/public/renderer/render_process_observer.h" | 14 #include "content/public/renderer/render_process_observer.h" |
15 #include "ipc/ipc_platform_file.h" | 15 #include "ipc/ipc_platform_file.h" |
16 | 16 |
17 namespace base { | |
18 class MemoryMappedFile; | |
19 } | |
20 | |
21 typedef struct _HyphenDict HyphenDict; | 17 typedef struct _HyphenDict HyphenDict; |
22 | 18 |
23 namespace content { | 19 namespace content { |
24 class RenderThread; | 20 class RenderThread; |
25 | 21 |
26 // A class that hyphenates a word. This class encapsulates the hyphen library | 22 // A class that hyphenates a word. This class encapsulates the hyphen library |
27 // and manages resources used by the library. When this class uses a huge | 23 // and manages resources used by the library. When this class uses a huge |
28 // dictionary, it takes lots of memory (~1.3MB for English). A renderer should | 24 // dictionary, it takes lots of memory (~1.3MB for English). A renderer should |
29 // create this object only when it renders a page that needs hyphenation and | 25 // create this object only when it renders a page that needs hyphenation and |
30 // deletes it when it moves to a page that does not need hyphenation. | 26 // deletes it when it moves to a page that does not need hyphenation. |
(...skipping 20 matching lines...) Expand all Loading... |
51 | 47 |
52 // RenderProcessObserver implementation. | 48 // RenderProcessObserver implementation. |
53 virtual bool OnControlMessageReceived(const IPC::Message& message) OVERRIDE; | 49 virtual bool OnControlMessageReceived(const IPC::Message& message) OVERRIDE; |
54 | 50 |
55 private: | 51 private: |
56 void OnSetDictionary(IPC::PlatformFileForTransit rule_file); | 52 void OnSetDictionary(IPC::PlatformFileForTransit rule_file); |
57 | 53 |
58 // The dictionary used by the hyphen library. | 54 // The dictionary used by the hyphen library. |
59 HyphenDict* dictionary_; | 55 HyphenDict* dictionary_; |
60 | 56 |
61 // The dictionary file and its memory-mapping object. (Our copy of the hyphen | |
62 // library uses a memory-mapped file opened by a browser so renderers can use | |
63 // it without opening the file.) | |
64 string16 locale_; | 57 string16 locale_; |
65 base::PlatformFile rule_file_; | 58 ScopedStdioHandle dictionary_file_; |
66 scoped_ptr<base::MemoryMappedFile> rule_map_; | |
67 | 59 |
68 // A cached result. WebKit often calls ComputeLastHyphenLocation with the same | 60 // A cached result. WebKit often calls ComputeLastHyphenLocation with the same |
69 // word multiple times to find the best hyphenation point when it finds a line | 61 // word multiple times to find the best hyphenation point when it finds a line |
70 // break. On the other hand, the hyphen library returns all hyphenation points | 62 // break. On the other hand, the hyphen library returns all hyphenation points |
71 // for a word. This class caches the hyphenation points returned by the hyphen | 63 // for a word. This class caches the hyphenation points returned by the hyphen |
72 // library to avoid calling the library multiple times. | 64 // library to avoid calling the library multiple times. |
73 string16 word_; | 65 string16 word_; |
74 bool result_; | 66 bool result_; |
75 std::vector<int> hyphen_offsets_; | 67 std::vector<int> hyphen_offsets_; |
76 | 68 |
77 DISALLOW_COPY_AND_ASSIGN(Hyphenator); | 69 DISALLOW_COPY_AND_ASSIGN(Hyphenator); |
78 }; | 70 }; |
79 | 71 |
80 } // namespace content | 72 } // namespace content |
81 | 73 |
82 #endif // CONTENT_RENDERER_HYPHENATOR_HYPHENATOR_H_ | 74 #endif // CONTENT_RENDERER_HYPHENATOR_HYPHENATOR_H_ |
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