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31 #ifndef UniscribeHelperTextRun_h
32 #define UniscribeHelperTextRun_h
34 #include "UniscribeHelper.h"
41 // Wrapper around the Uniscribe helper that automatically sets it up with the
42 // WebKit types we supply.
43 class UniscribeHelperTextRun : public UniscribeHelper {
45 // Regular constructor used for WebCore text run processing.
46 UniscribeHelperTextRun(const TextRun&, const Font&);
48 // Constructor with the same interface as the gfx::UniscribeState. Using
49 // this constructor will not give you font fallback, but it will provide
50 // the ability to load fonts that may not be in the OS cache
51 // ("TryToPreloadFont") if the caller does not have a TextRun/Font.
52 UniscribeHelperTextRun(const wchar_t* input,
57 SCRIPT_FONTPROPERTIES*);
60 virtual void tryToPreloadFont(HFONT);
63 // This function retrieves the Windows font data (HFONT, etc) for the next
64 // WebKit font in the list. If the font data corresponding to font_index_
65 // has been obtained before, returns the values stored in our internal
66 // vectors (hfonts_, etc). Otherwise, it gets next SimpleFontData from
67 // WebKit and adds them to in hfonts_ and friends so that font data can be
68 // returned quickly next time they're requested.
69 virtual bool nextWinFontData(HFONT*, SCRIPT_CACHE**, SCRIPT_FONTPROPERTIES**, int* ascent);
70 virtual void resetFontIndex();
72 // Reference to WebKit::Font that contains all the information about fonts
73 // we can use to render this input run of text. It is used in
74 // NextWinFontData to retrieve Windows font data for a series of
77 // This pointer can be NULL for no font fallback handling.
80 // It's rare that many fonts are listed in stylesheets.
81 // Four would be large enough in most cases.
82 const static size_t kNumberOfFonts = 4;
84 // These vectors are used to store Windows font data for non-primary fonts.
85 Vector<HFONT, kNumberOfFonts> m_hfonts;
86 Vector<SCRIPT_CACHE*, kNumberOfFonts> m_scriptCaches;
87 Vector<SCRIPT_FONTPROPERTIES*, kNumberOfFonts> m_fontProperties;
88 Vector<int, kNumberOfFonts> m_ascents;
90 // Index of the fallback font we're currently using for NextWinFontData.
94 } // namespace WebCore
96 #endif // UniscribeHelperTextRun_h