Home | History | Annotate | Download | only in harfbuzz 
      1 /*
      2  * Copyright (c) 2006, 2007, 2008, Google Inc. All rights reserved.
      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,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     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 FontPlatformDataHarfBuzz_h
     32 #define FontPlatformDataHarfBuzz_h
     33 
     34 #include "SkPaint.h"
     35 #include "platform/SharedBuffer.h"
     36 #include "platform/fonts/FontDescription.h"
     37 #include "platform/fonts/FontOrientation.h"
     38 #include "platform/fonts/FontRenderStyle.h"
     39 #include "platform/fonts/opentype/OpenTypeVerticalData.h"
     40 #include "wtf/Forward.h"
     41 #include "wtf/HashTableDeletedValueType.h"
     42 #include "wtf/RefPtr.h"
     43 #include "wtf/text/CString.h"
     44 #include "wtf/text/StringImpl.h"
     45 
     46 class SkTypeface;
     47 typedef uint32_t SkFontID;
     48 
     49 namespace WebCore {
     50 
     51 class GraphicsContext;
     52 class HarfBuzzFace;
     53 
     54 // -----------------------------------------------------------------------------
     55 // FontPlatformData is the handle which WebKit has on a specific face. A face
     56 // is the tuple of (font, size, ...etc). Here we are just wrapping a Skia
     57 // SkTypeface pointer and dealing with the reference counting etc.
     58 // -----------------------------------------------------------------------------
     59 class PLATFORM_EXPORT FontPlatformData {
     60 public:
     61     // Used for deleted values in the font cache's hash tables. The hash table
     62     // will create us with this structure, and it will compare other values
     63     // to this "Deleted" one. It expects the Deleted one to be differentiable
     64     // from the 0 one (created with the empty constructor), so we can't just
     65     // set everything to 0.
     66     FontPlatformData(WTF::HashTableDeletedValueType);
     67     FontPlatformData();
     68     FontPlatformData(float textSize, bool fakeBold, bool fakeItalic);
     69     FontPlatformData(const FontPlatformData&);
     70     FontPlatformData(PassRefPtr<SkTypeface>, const char* name, float textSize, bool fakeBold, bool fakeItalic, FontOrientation = Horizontal, bool subpixelTextPosition = FontDescription::subpixelPositioning());
     71     FontPlatformData(const FontPlatformData& src, float textSize);
     72     ~FontPlatformData();
     73 
     74     String fontFamilyName() const;
     75 
     76     // -------------------------------------------------------------------------
     77     // Return true iff this font is monospaced (i.e. every glyph has an equal x
     78     // advance)
     79     // -------------------------------------------------------------------------
     80     bool isFixedPitch() const;
     81 
     82     // -------------------------------------------------------------------------
     83     // Setup a Skia painting context to use this font.
     84     // -------------------------------------------------------------------------
     85     void setupPaint(SkPaint*, GraphicsContext* = 0) const;
     86 
     87     // -------------------------------------------------------------------------
     88     // Return Skia's unique id for this font. This encodes both the style and
     89     // the font's file name so refers to a single face.
     90     // -------------------------------------------------------------------------
     91     SkFontID uniqueID() const;
     92     SkTypeface* typeface() const { return m_typeface.get(); }
     93 
     94     unsigned hash() const;
     95     float size() const { return m_textSize; }
     96     int emSizeInFontUnits() const;
     97 
     98     FontOrientation orientation() const { return m_orientation; }
     99     void setOrientation(FontOrientation orientation) { m_orientation = orientation; }
    100     void setFakeBold(bool fakeBold) { m_fakeBold = fakeBold; }
    101     void setFakeItalic(bool fakeItalic) { m_fakeItalic = fakeItalic; }
    102     bool operator==(const FontPlatformData&) const;
    103     FontPlatformData& operator=(const FontPlatformData&);
    104     bool isHashTableDeletedValue() const { return m_isHashTableDeletedValue; }
    105 
    106 #if ENABLE(OPENTYPE_VERTICAL)
    107     PassRefPtr<OpenTypeVerticalData> verticalData() const;
    108     PassRefPtr<SharedBuffer> openTypeTable(uint32_t table) const;
    109 #endif
    110 
    111 #ifndef NDEBUG
    112     String description() const;
    113 #endif
    114 
    115     HarfBuzzFace* harfBuzzFace() const;
    116 
    117     // The returned styles are all actual styles without FontRenderStyle::NoPreference.
    118     const FontRenderStyle& fontRenderStyle() const { return m_style; }
    119 
    120     // -------------------------------------------------------------------------
    121     // Global font preferences...
    122 
    123     static void setHinting(SkPaint::Hinting);
    124     static void setAutoHint(bool);
    125     static void setUseBitmaps(bool);
    126     static void setAntiAlias(bool);
    127     static void setSubpixelRendering(bool);
    128 
    129 private:
    130     void getRenderStyleForStrike(const char*, int);
    131     void querySystemForRenderStyle(bool useSkiaSubpixelPositioning);
    132 
    133     RefPtr<SkTypeface> m_typeface;
    134     CString m_family;
    135     float m_textSize;
    136     mutable int m_emSizeInFontUnits;
    137     bool m_fakeBold;
    138     bool m_fakeItalic;
    139     FontOrientation m_orientation;
    140     FontRenderStyle m_style;
    141     mutable RefPtr<HarfBuzzFace> m_harfBuzzFace;
    142     bool m_isHashTableDeletedValue;
    143 };
    144 
    145 } // namespace WebCore
    146 
    147 #endif // ifdef FontPlatformDataHarfBuzz_h
    148