| // 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 UI_GFX_FONT_FALLBACK_WIN_H_ |
| #define UI_GFX_FONT_FALLBACK_WIN_H_ |
| |
| #include <stddef.h> |
| |
| #include <string> |
| #include <vector> |
| |
| #include "base/macros.h" |
| #include "ui/gfx/font.h" |
| #include "ui/gfx/font_fallback.h" |
| |
| namespace gfx { |
| |
| // Internals of font_fallback_win.cc exposed for testing. |
| namespace internal { |
| |
| // Parses comma separated SystemLink |entry|, per the format described here: |
| // http://msdn.microsoft.com/en-us/goglobal/bb688134.aspx |
| // |
| // Sets |filename| and |font_name| respectively. If a field is not present |
| // or could not be parsed, the corresponding parameter will be cleared. |
| void GFX_EXPORT ParseFontLinkEntry(const std::string& entry, |
| std::string* filename, |
| std::string* font_name); |
| |
| // Parses a font |family| in the format "FamilyFoo & FamilyBar (TrueType)". |
| // Splits by '&' and strips off the trailing parenthesized expression. |
| void GFX_EXPORT ParseFontFamilyString(const std::string& family, |
| std::vector<std::string>* font_names); |
| |
| // Iterator over linked fallback fonts for a given font. The linked font chain |
| // comes from the Windows registry, but gets cached between uses. |
| class GFX_EXPORT LinkedFontsIterator { |
| public: |
| // Instantiates the iterator over the linked font chain for |font|. The first |
| // item will be |font| itself. |
| explicit LinkedFontsIterator(Font font); |
| virtual ~LinkedFontsIterator(); |
| |
| // Sets the font that would be returned by the next call to |NextFont()|, |
| // useful for inserting one-time entries into the iterator chain. |
| void SetNextFont(Font font); |
| |
| // Gets the next font in the link chain, if available, and increments the |
| // iterator. Returns |true| on success or |false| if the iterator is past |
| // last item (in that case, the value of |font| should not be used). If |
| // |SetNextFont()| was called, returns the font set that way and clears it. |
| bool NextFont(Font* font); |
| |
| protected: |
| // Retrieves the list of linked fonts. Protected and virtual so that it may |
| // be overridden by tests. |
| virtual const std::vector<Font>* GetLinkedFonts() const; |
| |
| private: |
| // Original font whose linked fonts are being iterated over. |
| Font original_font_; |
| |
| // Font that was set via |SetNextFont()|. |
| Font next_font_; |
| |
| // Indicates whether |SetNextFont()| was called. |
| bool next_font_set_; |
| |
| // The font most recently returned by |NextFont()|. |
| Font current_font_; |
| |
| // List of linked fonts; weak pointer. |
| const std::vector<Font>* linked_fonts_; |
| |
| // Index of the current entry in the |linked_fonts_| list. |
| size_t linked_font_index_; |
| |
| DISALLOW_COPY_AND_ASSIGN(LinkedFontsIterator); |
| }; |
| |
| } // namespace internal |
| |
| // Finds a fallback font to render the specified |text| with respect to an |
| // initial |font|. Returns the resulting font via out param |result|. Returns |
| // |true| if a fallback font was found. |
| bool GFX_EXPORT GetFallbackFont(const Font& font, |
| const wchar_t* text, |
| int text_length, |
| Font* result); |
| |
| } // namespace gfx |
| |
| #endif // UI_GFX_FONT_FALLBACK_WIN_H_ |