gecko-dev/gfx/thebes/gfxGDIFont.h

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 * Contributor(s):
 *   Stuart Parmenter <stuart@mozilla.com>
 *   Masayuki Nakano <masayuki@d-toybox.com>
 *   John Daggett <jdaggett@mozilla.com>
 *   Jonathan Kew <jfkthame@gmail.com>
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#ifndef GFX_GDIFONT_H
#define GFX_GDIFONT_H

#include "gfxFont.h"
#include "gfxGDIFontList.h"

#include "nsDataHashtable.h"
#include "nsHashKeys.h"

#include "cairo.h"

class gfxGDIFont : public gfxFont
{
public:
    gfxGDIFont(GDIFontEntry *aFontEntry,
               const gfxFontStyle *aFontStyle,
               PRBool aNeedsBold,
               AntialiasOption anAAOption = kAntialiasDefault);

    virtual ~gfxGDIFont();

    HFONT GetHFONT() { if (!mMetrics) Initialize(); return mFont; }

    gfxFloat GetAdjustedSize() const { return mAdjustedSize; }

    cairo_font_face_t   *CairoFontFace() { return mFontFace; }
    cairo_scaled_font_t *CairoScaledFont() { return mScaledFont; }

    /* overrides for the pure virtual methods in gfxFont */
    virtual const gfxFont::Metrics& GetMetrics();

    virtual PRUint32 GetSpaceGlyph();

    virtual PRBool SetupCairoFont(gfxContext *aContext);

    /* required for MathML to suppress effects of ClearType "padding" */
    virtual gfxFont* CopyWithAntialiasOption(AntialiasOption anAAOption);

    /* override to check for uniscribe failure and fall back to GDI */
    virtual PRBool InitTextRun(gfxContext *aContext,
                               gfxTextRun *aTextRun,
                               const PRUnichar *aString,
                               PRUint32 aRunStart,
                               PRUint32 aRunLength,
                               PRInt32 aRunScript,
                               PRBool aPreferPlatformShaping = PR_FALSE);

    virtual PRBool ProvidesHintedWidths() const { return PR_TRUE; }

    // get hinted glyph width in pixels as 16.16 fixed-point value
    virtual PRInt32 GetHintedGlyphWidth(gfxContext *aCtx, PRUint16 aGID);

protected:
    virtual void CreatePlatformShaper();

    void Initialize(); // creates metrics and Cairo fonts

    void FillLogFont(LOGFONTW& aLogFont, gfxFloat aSize);

    // mPlatformShaper is used for the GDI shaper, mUniscribeShaper
    // for the Uniscribe version if needed
    nsAutoPtr<gfxFontShaper>   mUniscribeShaper;

    HFONT                 mFont;
    cairo_font_face_t    *mFontFace;
    cairo_scaled_font_t  *mScaledFont;

    Metrics              *mMetrics;
    PRUint32              mSpaceGlyph;

    PRBool                mNeedsBold;

    // cache of glyph widths in 16.16 fixed-point pixels
    nsDataHashtable<nsUint32HashKey,PRInt32>    mGlyphWidths;
};

#endif /* GFX_GDIFONT_H */