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 UI_GFX_FONT_FALLBACK_WIN_H_ 6 #define UI_GFX_FONT_FALLBACK_WIN_H_ 7 8 #include <string> 9 #include <vector> 10 11 #include "ui/gfx/font.h" 12 #include "ui/gfx/font_fallback.h" 13 14 namespace gfx { 15 16 // Internals of font_fallback_win.cc exposed for testing. 17 namespace internal { 18 19 // Parses comma separated SystemLink |entry|, per the format described here: 20 // http://msdn.microsoft.com/en-us/goglobal/bb688134.aspx 21 // 22 // Sets |filename| and |font_name| respectively. If a field is not present 23 // or could not be parsed, the corresponding parameter will be cleared. 24 void GFX_EXPORT ParseFontLinkEntry(const std::string& entry, 25 std::string* filename, 26 std::string* font_name); 27 28 // Parses a font |family| in the format "FamilyFoo & FamilyBar (TrueType)". 29 // Splits by '&' and strips off the trailing parenthesized expression. 30 void GFX_EXPORT ParseFontFamilyString(const std::string& family, 31 std::vector<std::string>* font_names); 32 33 // Iterator over linked fallback fonts for a given font. The linked font chain 34 // comes from the Windows registry, but gets cached between uses. 35 class GFX_EXPORT LinkedFontsIterator { 36 public: 37 // Instantiates the iterator over the linked font chain for |font|. The first 38 // item will be |font| itself. 39 explicit LinkedFontsIterator(Font font); 40 virtual ~LinkedFontsIterator(); 41 42 // Sets the font that would be returned by the next call to |NextFont()|, 43 // useful for inserting one-time entries into the iterator chain. 44 void SetNextFont(Font font); 45 46 // Gets the next font in the link chain, if available, and increments the 47 // iterator. Returns |true| on success or |false| if the iterator is past 48 // last item (in that case, the value of |font| should not be used). If 49 // |SetNextFont()| was called, returns the font set that way and clears it. 50 bool NextFont(Font* font); 51 52 protected: 53 // Retrieves the list of linked fonts. Protected and virtual so that it may 54 // be overridden by tests. 55 virtual const std::vector<Font>* GetLinkedFonts() const; 56 57 private: 58 // Original font whose linked fonts are being iterated over. 59 Font original_font_; 60 61 // Font that was set via |SetNextFont()|. 62 Font next_font_; 63 64 // Indicates whether |SetNextFont()| was called. 65 bool next_font_set_; 66 67 // The font most recently returned by |NextFont()|. 68 Font current_font_; 69 70 // List of linked fonts; weak pointer. 71 const std::vector<Font>* linked_fonts_; 72 73 // Index of the current entry in the |linked_fonts_| list. 74 size_t linked_font_index_; 75 76 DISALLOW_COPY_AND_ASSIGN(LinkedFontsIterator); 77 }; 78 79 } // namespace internal 80 81 // Finds a fallback font to render the specified |text| with respect to an 82 // initial |font|. Returns the resulting font via out param |result|. Returns 83 // |true| if a fallback font was found. 84 bool GetUniscribeFallbackFont(const Font& font, 85 const wchar_t* text, 86 int text_length, 87 Font* result); 88 89 } // namespace gfx 90 91 #endif // UI_GFX_FONT_FALLBACK_WIN_H_ 92