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// 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 <string>
#include <vector>
#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 GetUniscribeFallbackFont(const Font& font,
const wchar_t* text,
int text_length,
Font* result);
} // namespace gfx
#endif // UI_GFX_FONT_FALLBACK_WIN_H_
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