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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
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      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
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef FontPlatformDataLinux_h
     32 #define FontPlatformDataLinux_h
     33 
     34 #include "FontOrientation.h"
     35 #include "FontRenderStyle.h"
     36 #include "TextOrientation.h"
     37 #include <wtf/Forward.h>
     38 #include <wtf/RefPtr.h>
     39 #include <wtf/text/CString.h>
     40 #include <wtf/text/StringImpl.h>
     41 #include <SkPaint.h>
     42 
     43 class SkTypeface;
     44 typedef uint32_t SkFontID;
     45 
     46 struct HB_FaceRec_;
     47 
     48 namespace WebCore {
     49 
     50 class FontDescription;
     51 
     52 // -----------------------------------------------------------------------------
     53 // FontPlatformData is the handle which WebKit has on a specific face. A face
     54 // is the tuple of (font, size, ...etc). Here we are just wrapping a Skia
     55 // SkTypeface pointer and dealing with the reference counting etc.
     56 // -----------------------------------------------------------------------------
     57 class FontPlatformData {
     58 public:
     59     // Used for deleted values in the font cache's hash tables. The hash table
     60     // will create us with this structure, and it will compare other values
     61     // to this "Deleted" one. It expects the Deleted one to be differentiable
     62     // from the NULL one (created with the empty constructor), so we can't just
     63     // set everything to NULL.
     64     FontPlatformData(WTF::HashTableDeletedValueType)
     65         : m_typeface(hashTableDeletedFontValue())
     66         , m_textSize(0)
     67         , m_emSizeInFontUnits(0)
     68         , m_fakeBold(false)
     69         , m_fakeItalic(false)
     70         , m_orientation(Horizontal)
     71         , m_textOrientation(TextOrientationVerticalRight)
     72         { }
     73 
     74     FontPlatformData()
     75         : m_typeface(0)
     76         , m_textSize(0)
     77         , m_emSizeInFontUnits(0)
     78         , m_fakeBold(false)
     79         , m_fakeItalic(false)
     80         , m_orientation(Horizontal)
     81         , m_textOrientation(TextOrientationVerticalRight)
     82         { }
     83 
     84     FontPlatformData(float textSize, bool fakeBold, bool fakeItalic)
     85         : m_typeface(0)
     86         , m_textSize(textSize)
     87         , m_emSizeInFontUnits(0)
     88         , m_fakeBold(fakeBold)
     89         , m_fakeItalic(fakeItalic)
     90         , m_orientation(Horizontal)
     91         , m_textOrientation(TextOrientationVerticalRight)
     92         { }
     93 
     94     FontPlatformData(const FontPlatformData&);
     95     FontPlatformData(SkTypeface*, const char* name, float textSize, bool fakeBold, bool fakeItalic, FontOrientation = Horizontal, TextOrientation = TextOrientationVerticalRight);
     96     FontPlatformData(const FontPlatformData& src, float textSize);
     97     ~FontPlatformData();
     98 
     99     // -------------------------------------------------------------------------
    100     // Return true iff this font is monospaced (i.e. every glyph has an equal x
    101     // advance)
    102     // -------------------------------------------------------------------------
    103     bool isFixedPitch() const;
    104 
    105     // -------------------------------------------------------------------------
    106     // Setup a Skia painting context to use this font.
    107     // -------------------------------------------------------------------------
    108     void setupPaint(SkPaint*) const;
    109 
    110     // -------------------------------------------------------------------------
    111     // Return Skia's unique id for this font. This encodes both the style and
    112     // the font's file name so refers to a single face.
    113     // -------------------------------------------------------------------------
    114     SkFontID uniqueID() const;
    115 
    116     unsigned hash() const;
    117     float size() const { return m_textSize; }
    118     int emSizeInFontUnits() const;
    119 
    120     FontOrientation orientation() const { return m_orientation; }
    121     void setOrientation(FontOrientation orientation) { m_orientation = orientation; }
    122 
    123     bool operator==(const FontPlatformData&) const;
    124     FontPlatformData& operator=(const FontPlatformData&);
    125     bool isHashTableDeletedValue() const { return m_typeface == hashTableDeletedFontValue(); }
    126 
    127 #ifndef NDEBUG
    128     String description() const;
    129 #endif
    130 
    131     HB_FaceRec_* harfbuzzFace() const;
    132 
    133     // -------------------------------------------------------------------------
    134     // Global font preferences...
    135 
    136     static void setHinting(SkPaint::Hinting);
    137     static void setAntiAlias(bool on);
    138     static void setSubpixelGlyphs(bool on);
    139 
    140 private:
    141     class RefCountedHarfbuzzFace : public RefCounted<RefCountedHarfbuzzFace> {
    142     public:
    143         static PassRefPtr<RefCountedHarfbuzzFace> create(HB_FaceRec_* harfbuzzFace)
    144         {
    145             return adoptRef(new RefCountedHarfbuzzFace(harfbuzzFace));
    146         }
    147 
    148         ~RefCountedHarfbuzzFace();
    149 
    150         HB_FaceRec_* face() const { return m_harfbuzzFace; }
    151 
    152     private:
    153         RefCountedHarfbuzzFace(HB_FaceRec_* harfbuzzFace) : m_harfbuzzFace(harfbuzzFace)
    154         {
    155         }
    156 
    157         HB_FaceRec_* m_harfbuzzFace;
    158     };
    159 
    160     void querySystemForRenderStyle();
    161 
    162     // FIXME: Could SkAutoUnref be used here?
    163     SkTypeface* m_typeface;
    164     CString m_family;
    165     float m_textSize;
    166     mutable int m_emSizeInFontUnits;
    167     bool m_fakeBold;
    168     bool m_fakeItalic;
    169     FontOrientation m_orientation;
    170     TextOrientation m_textOrientation;
    171     FontRenderStyle m_style;
    172     mutable RefPtr<RefCountedHarfbuzzFace> m_harfbuzzFace;
    173 
    174     SkTypeface* hashTableDeletedFontValue() const { return reinterpret_cast<SkTypeface*>(-1); }
    175 };
    176 
    177 }  // namespace WebCore
    178 
    179 #endif  // ifdef FontPlatformData_h
    180