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      1 /*
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      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
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      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
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     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
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     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef FontPlatformDataHarfBuzz_h
     32 #define FontPlatformDataHarfBuzz_h
     33 
     34 #include "SkPaint.h"
     35 #include "core/platform/SharedBuffer.h"
     36 #include "core/platform/graphics/FontOrientation.h"
     37 #include "core/platform/graphics/chromium/FontRenderStyle.h"
     38 #include "core/platform/graphics/opentype/OpenTypeVerticalData.h"
     39 #include "wtf/Forward.h"
     40 #include "wtf/HashTableDeletedValueType.h"
     41 #include "wtf/RefPtr.h"
     42 #include "wtf/text/CString.h"
     43 #include "wtf/text/StringImpl.h"
     44 
     45 class SkTypeface;
     46 typedef uint32_t SkFontID;
     47 
     48 namespace WebCore {
     49 
     50 class FontDescription;
     51 class HarfBuzzFace;
     52 
     53 // -----------------------------------------------------------------------------
     54 // FontPlatformData is the handle which WebKit has on a specific face. A face
     55 // is the tuple of (font, size, ...etc). Here we are just wrapping a Skia
     56 // SkTypeface pointer and dealing with the reference counting etc.
     57 // -----------------------------------------------------------------------------
     58 class FontPlatformData {
     59 public:
     60     // Used for deleted values in the font cache's hash tables. The hash table
     61     // will create us with this structure, and it will compare other values
     62     // to this "Deleted" one. It expects the Deleted one to be differentiable
     63     // from the 0 one (created with the empty constructor), so we can't just
     64     // set everything to 0.
     65     FontPlatformData(WTF::HashTableDeletedValueType);
     66     FontPlatformData();
     67     FontPlatformData(float textSize, bool fakeBold, bool fakeItalic);
     68     FontPlatformData(const FontPlatformData&);
     69     FontPlatformData(SkTypeface*, const char* name, float textSize, bool fakeBold, bool fakeItalic, FontOrientation = Horizontal);
     70     FontPlatformData(const FontPlatformData& src, float textSize);
     71     ~FontPlatformData();
     72 
     73     // -------------------------------------------------------------------------
     74     // Return true iff this font is monospaced (i.e. every glyph has an equal x
     75     // advance)
     76     // -------------------------------------------------------------------------
     77     bool isFixedPitch() const;
     78 
     79     // -------------------------------------------------------------------------
     80     // Setup a Skia painting context to use this font.
     81     // -------------------------------------------------------------------------
     82     void setupPaint(SkPaint*) const;
     83 
     84     // -------------------------------------------------------------------------
     85     // Return Skia's unique id for this font. This encodes both the style and
     86     // the font's file name so refers to a single face.
     87     // -------------------------------------------------------------------------
     88     SkFontID uniqueID() const;
     89     SkTypeface* typeface() const { return m_typeface.get(); }
     90 
     91     unsigned hash() const;
     92     float size() const { return m_textSize; }
     93     int emSizeInFontUnits() const;
     94 
     95     FontOrientation orientation() const { return m_orientation; }
     96     void setOrientation(FontOrientation orientation) { m_orientation = orientation; }
     97     void setFakeBold(bool fakeBold) { m_fakeBold = fakeBold; }
     98     void setFakeItalic(bool fakeItalic) { m_fakeItalic = fakeItalic; }
     99     bool operator==(const FontPlatformData&) const;
    100     FontPlatformData& operator=(const FontPlatformData&);
    101     bool isHashTableDeletedValue() const { return m_isHashTableDeletedValue; }
    102 
    103 #if ENABLE(OPENTYPE_VERTICAL)
    104     PassRefPtr<OpenTypeVerticalData> verticalData() const;
    105     PassRefPtr<SharedBuffer> openTypeTable(uint32_t table) const;
    106 #endif
    107 
    108 #ifndef NDEBUG
    109     String description() const;
    110 #endif
    111 
    112     HarfBuzzFace* harfBuzzFace() const;
    113 
    114     // The returned styles are all actual styles without FontRenderStyle::NoPreference.
    115     const FontRenderStyle& fontRenderStyle() const { return m_style; }
    116 
    117     // -------------------------------------------------------------------------
    118     // Global font preferences...
    119 
    120     static void setHinting(SkPaint::Hinting);
    121     static void setAutoHint(bool);
    122     static void setUseBitmaps(bool);
    123     static void setAntiAlias(bool);
    124     static void setSubpixelRendering(bool);
    125     static void setSubpixelPositioning(bool);
    126 
    127 private:
    128     void getRenderStyleForStrike(const char*, int);
    129     void querySystemForRenderStyle();
    130 
    131     RefPtr<SkTypeface> m_typeface;
    132     CString m_family;
    133     float m_textSize;
    134     mutable int m_emSizeInFontUnits;
    135     bool m_fakeBold;
    136     bool m_fakeItalic;
    137     FontOrientation m_orientation;
    138     FontRenderStyle m_style;
    139     mutable RefPtr<HarfBuzzFace> m_harfBuzzFace;
    140     bool m_isHashTableDeletedValue;
    141 };
    142 
    143 } // namespace WebCore
    144 
    145 #endif // ifdef FontPlatformDataHarfBuzz_h
    146