gecko-dev/gfx/thebes/gfxMacFont.h

/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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 * The Original Code is Mozilla Corporation code.
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 * The Initial Developer of the Original Code is Mozilla Foundation.
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 * Contributor(s):
 *   Vladimir Vukicevic <vladimir@pobox.com>
 *   Masayuki Nakano <masayuki@d-toybox.com>
 *   John Daggett <jdaggett@mozilla.com>
 *   Jonathan Kew <jfkthame@gmail.com>
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#ifndef GFX_MACFONT_H
#define GFX_MACFONT_H

#include "gfxFont.h"
#include "gfxMacPlatformFontList.h"
#include "mozilla/gfx/2D.h"

#include "cairo.h"

class gfxMacFont : public gfxFont
{
public:
    gfxMacFont(MacOSFontEntry *aFontEntry, const gfxFontStyle *aFontStyle,
               bool aNeedsBold);

    virtual ~gfxMacFont();

    CGFontRef GetCGFontRef() const { return mCGFont; }

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

    virtual PRUint32 GetSpaceGlyph() {
        return mSpaceGlyph;
    }

    virtual bool SetupCairoFont(gfxContext *aContext);

    /* override Measure to add padding for antialiasing */
    virtual RunMetrics Measure(gfxTextRun *aTextRun,
                               PRUint32 aStart, PRUint32 aEnd,
                               BoundingBoxType aBoundingBoxType,
                               gfxContext *aContextForTightBoundingBox,
                               Spacing *aSpacing);

    // override gfxFont table access function to bypass gfxFontEntry cache,
    // use CGFontRef API to get direct access to system font data
    virtual hb_blob_t *GetFontTable(PRUint32 aTag);

    mozilla::RefPtr<mozilla::gfx::ScaledFont> GetScaledFont();

protected:
    virtual void CreatePlatformShaper();

    // override to prefer CoreText shaping with fonts that depend on AAT
    virtual bool InitTextRun(gfxContext *aContext,
                               gfxTextRun *aTextRun,
                               const PRUnichar *aString,
                               PRUint32 aRunStart,
                               PRUint32 aRunLength,
                               PRInt32 aRunScript,
                               bool aPreferPlatformShaping = false);

    void InitMetrics();
    void InitMetricsFromPlatform();
    void InitMetricsFromATSMetrics(ATSFontRef aFontRef);

    // Get width and glyph ID for a character; uses aConvFactor
    // to convert font units as returned by CG to actual dimensions
    gfxFloat GetCharWidth(CFDataRef aCmap, PRUnichar aUniChar,
                          PRUint32 *aGlyphID, gfxFloat aConvFactor);

    static void DestroyBlobFunc(void* aUserData);

    // a weak reference to the CoreGraphics font: this is owned by the
    // MacOSFontEntry, it is not retained or released by gfxMacFont
    CGFontRef             mCGFont;

    cairo_font_face_t    *mFontFace;

    Metrics               mMetrics;
    PRUint32              mSpaceGlyph;

    mozilla::RefPtr<mozilla::gfx::ScaledFont> mAzureFont;
};

#endif /* GFX_MACFONT_H */