Source/core/platform/graphics/harfbuzz/FontPlatformDataHarfBuzz.h

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 * copyright notice, this list of conditions and the following disclaimer
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#ifndef FontPlatformDataHarfBuzz_h
#define FontPlatformDataHarfBuzz_h

#include "SkPaint.h"
#include "platform/SharedBuffer.h"
#include "core/platform/graphics/chromium/FontRenderStyle.h"
#include "core/platform/graphics/opentype/OpenTypeVerticalData.h"
#include "platform/fonts/FontOrientation.h"
#include "wtf/Forward.h"
#include "wtf/HashTableDeletedValueType.h"
#include "wtf/RefPtr.h"
#include "wtf/text/CString.h"
#include "wtf/text/StringImpl.h"

class SkTypeface;
typedef uint32_t SkFontID;

namespace WebCore {

class FontDescription;
class GraphicsContext;
class HarfBuzzFace;

// -----------------------------------------------------------------------------
// FontPlatformData is the handle which WebKit has on a specific face. A face
// is the tuple of (font, size, ...etc). Here we are just wrapping a Skia
// SkTypeface pointer and dealing with the reference counting etc.
// -----------------------------------------------------------------------------
class FontPlatformData {
public:
    // Used for deleted values in the font cache's hash tables. The hash table
    // will create us with this structure, and it will compare other values
    // to this "Deleted" one. It expects the Deleted one to be differentiable
    // from the 0 one (created with the empty constructor), so we can't just
    // set everything to 0.
    FontPlatformData(WTF::HashTableDeletedValueType);
    FontPlatformData();
    FontPlatformData(float textSize, bool fakeBold, bool fakeItalic);
    FontPlatformData(const FontPlatformData&);
    FontPlatformData(PassRefPtr<SkTypeface>, const char* name, float textSize, bool fakeBold, bool fakeItalic, FontOrientation = Horizontal);
    FontPlatformData(const FontPlatformData& src, float textSize);
    ~FontPlatformData();

    String fontFamilyName() const;

    // -------------------------------------------------------------------------
    // Return true iff this font is monospaced (i.e. every glyph has an equal x
    // advance)
    // -------------------------------------------------------------------------
    bool isFixedPitch() const;

    // -------------------------------------------------------------------------
    // Setup a Skia painting context to use this font.
    // -------------------------------------------------------------------------
    void setupPaint(SkPaint*, GraphicsContext* = 0) const;

    // -------------------------------------------------------------------------
    // Return Skia's unique id for this font. This encodes both the style and
    // the font's file name so refers to a single face.
    // -------------------------------------------------------------------------
    SkFontID uniqueID() const;
    SkTypeface* typeface() const { return m_typeface.get(); }

    unsigned hash() const;
    float size() const { return m_textSize; }
    int emSizeInFontUnits() const;

    FontOrientation orientation() const { return m_orientation; }
    void setOrientation(FontOrientation orientation) { m_orientation = orientation; }
    void setFakeBold(bool fakeBold) { m_fakeBold = fakeBold; }
    void setFakeItalic(bool fakeItalic) { m_fakeItalic = fakeItalic; }
    bool operator==(const FontPlatformData&) const;
    FontPlatformData& operator=(const FontPlatformData&);
    bool isHashTableDeletedValue() const { return m_isHashTableDeletedValue; }

#if ENABLE(OPENTYPE_VERTICAL)
    PassRefPtr<OpenTypeVerticalData> verticalData() const;
    PassRefPtr<SharedBuffer> openTypeTable(uint32_t table) const;
#endif

#ifndef NDEBUG
    String description() const;
#endif

    HarfBuzzFace* harfBuzzFace() const;

    // The returned styles are all actual styles without FontRenderStyle::NoPreference.
    const FontRenderStyle& fontRenderStyle() const { return m_style; }

    // -------------------------------------------------------------------------
    // Global font preferences...

    static void setHinting(SkPaint::Hinting);
    static void setAutoHint(bool);
    static void setUseBitmaps(bool);
    static void setAntiAlias(bool);
    static void setSubpixelRendering(bool);
    static void setSubpixelPositioning(bool);

private:
    void getRenderStyleForStrike(const char*, int);
    void querySystemForRenderStyle();

    RefPtr<SkTypeface> m_typeface;
    CString m_family;
    float m_textSize;
    mutable int m_emSizeInFontUnits;
    bool m_fakeBold;
    bool m_fakeItalic;
    FontOrientation m_orientation;
    FontRenderStyle m_style;
    mutable RefPtr<HarfBuzzFace> m_harfBuzzFace;
    bool m_isHashTableDeletedValue;
};

} // namespace WebCore

#endif // ifdef FontPlatformDataHarfBuzz_h