text: /*
   * Copyright (c) 2012 Google Inc. All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are
   * met:
   *
   *     * Redistributions of source code must retain the above copyright
   * notice, this list of conditions and the following disclaimer.
   *     * Redistributions in binary form must reproduce the above
   * copyright notice, this list of conditions and the following disclaimer
   * in the documentation and/or other materials provided with the
   * distribution.
   *     * Neither the name of Google Inc. nor the names of its
   * contributors may be used to endorse or promote products derived from
   * this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_SHAPING_HARF_BUZZ_FACE_H_
  #define THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_SHAPING_HARF_BUZZ_FACE_H_
  
  #include "base/memory/scoped_refptr.h"
  #include "third_party/blink/renderer/platform/fonts/typesetting_features.h"
  #include "third_party/blink/renderer/platform/fonts/unicode_range_set.h"
  #include "third_party/blink/renderer/platform/wtf/allocator.h"
  #include "third_party/blink/renderer/platform/wtf/hash_map.h"
  #include "third_party/blink/renderer/platform/wtf/noncopyable.h"
  #include "third_party/blink/renderer/platform/wtf/ref_counted.h"
  #include "third_party/blink/renderer/platform/wtf/text/character_names.h"
  
  #include <hb.h>
  
  namespace blink {
  
  class FontPlatformData;
  struct HarfBuzzFontData;
  
  class HarfBuzzFace : public RefCounted<HarfBuzzFace> {
    WTF_MAKE_NONCOPYABLE(HarfBuzzFace);
  
   public:
    static scoped_refptr<HarfBuzzFace> Create(FontPlatformData* platform_data,
                                       uint64_t unique_id) {
      return base::AdoptRef(new HarfBuzzFace(platform_data, unique_id));
    }
    ~HarfBuzzFace();
  
    enum VerticalLayoutCallbacks { PrepareForVerticalLayout, NoVerticalLayout };
  
    // In order to support the restricting effect of unicode-range optionally a
    // range restriction can be passed in, which will restrict which glyphs we
    // return in the harfBuzzGetGlyph function.
    hb_font_t* GetScaledFont(scoped_refptr<UnicodeRangeSet>,
                             VerticalLayoutCallbacks) const;
  
    bool HasSpaceInLigaturesOrKerning(TypesettingFeatures);
    unsigned UnitsPerEmFromHeadTable();
  
    bool ShouldSubpixelPosition();
  
   private:
    HarfBuzzFace(FontPlatformData*, uint64_t);
  
    hb_face_t* CreateFace();
    void PrepareHarfBuzzFontData();
  
    FontPlatformData* platform_data_;
    uint64_t unique_id_;
    hb_font_t* unscaled_font_;
    HarfBuzzFontData* harf_buzz_font_data_;
  };
  
  }  // namespace blink
  
  #endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_SHAPING_HARF_BUZZ_FACE_H_
  