Index: content/renderer/hyphenator/hyphenator.h |
=================================================================== |
--- content/renderer/hyphenator/hyphenator.h (revision 0) |
+++ content/renderer/hyphenator/hyphenator.h (revision 0) |
@@ -0,0 +1,66 @@ |
+// Copyright (c) 2012 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#ifndef CONTENT_RENDERER_HYPHENATOR_HYPHENATOR_H_ |
+#define CONTENT_RENDERER_HYPHENATOR_HYPHENATOR_H_ |
+ |
+#include <vector> |
+ |
+#include "base/memory/scoped_ptr.h" |
+#include "base/platform_file.h" |
+#include "base/string16.h" |
+#include "content/common/content_export.h" |
+ |
+namespace file_util { |
+class MemoryMappedFile; |
+} |
+ |
+typedef struct _HyphenDict HyphenDict; |
+ |
+namespace content { |
+ |
+// A class that hyphenates a word. This class encapsulates the hyphen library |
+// and manages resources used by the library. When this class uses a huge |
+// dictionary, it takes lots of memory (~1.3MB for English). A renderer should |
+// create this object only when it renders a page that needs hyphenation and |
+// deletes it when it moves to a page that does not need hyphenation. |
+class CONTENT_EXPORT Hyphenator { |
+ public: |
+ explicit Hyphenator(base::PlatformFile file); |
+ ~Hyphenator(); |
+ |
+ // Initializes the hyphen library and allocates resources needed for |
+ // hyphenation. |
+ bool Initialize(); |
+ |
+ // Returns the last hyphenation point, the position where we can insert a |
+ // hyphen, before the given position. If there are not any hyphenation points, |
+ // this function returns 0. |
+ size_t ComputeLastHyphenLocation(const string16& word, size_t before_index); |
+ |
+ private: |
+ // The dictionary used by the hyphen library. |
+ HyphenDict* dictionary_; |
+ |
+ // The dictionary file and its memory-mapping object. (Our copy of the hyphen |
+ // library uses a memory-mapped file opened by a browser so renderers can use |
+ // it without opening the file.) |
+ base::PlatformFile rule_file_; |
+ scoped_ptr<file_util::MemoryMappedFile> rule_map_; |
+ |
+ // A cached result. WebKit often calls ComputeLastHyphenLocation with the same |
+ // word multiple times to find the best hyphenation point when it finds a line |
+ // break. On the other hand, the hyphen library returns all hyphenation points |
+ // for a word. This class caches the hyphenation points returned by the hyphen |
+ // library to avoid calling the library multiple times. |
+ string16 word_; |
+ bool result_; |
+ std::vector<int> hyphen_offsets_; |
+ |
+ DISALLOW_COPY_AND_ASSIGN(Hyphenator); |
+}; |
+ |
+} // namespace content |
+ |
+#endif // CONTENT_RENDERER_HYPHENATOR_HYPHENATOR_H_ |
Property changes on: content\renderer\hyphenator\hyphenator.h |
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Added: svn:eol-style |
+ LF |