text: /*
   * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
   * Copyright (C) 2003, 2004, 2006, 2007, 2008 Apple Inc.  All right reserved.
   *
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Library General Public
   * License as published by the Free Software Foundation; either
   * version 2 of the License, or (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Library General Public License for more details.
   *
   * You should have received a copy of the GNU Library General Public License
   * along with this library; see the file COPYING.LIB.  If not, write to
   * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
   * Boston, MA 02110-1301, USA.
   *
   */
  
  #ifndef SKY_ENGINE_PLATFORM_TEXT_BIDICHARACTERRUN_H_
  #define SKY_ENGINE_PLATFORM_TEXT_BIDICHARACTERRUN_H_
  
  #include "flutter/sky/engine/platform/text/BidiContext.h"
  #include "flutter/sky/engine/platform/text/TextDirection.h"
  
  namespace blink {
  
  struct BidiCharacterRun {
      BidiCharacterRun(int start, int stop, BidiContext* context, WTF::Unicode::Direction dir)
          : m_override(context->override())
          , m_next(0)
          , m_start(start)
          , m_stop(stop)
      {
          ASSERT(m_start <= m_stop);
          if (dir == WTF::Unicode::OtherNeutral)
              dir = context->dir();
  
          m_level = context->level();
  
          // add level of run (cases I1 & I2)
          if (m_level % 2) {
              if (dir == WTF::Unicode::LeftToRight || dir == WTF::Unicode::ArabicNumber || dir == WTF::Unicode::EuropeanNumber)
                  m_level++;
          } else {
              if (dir == WTF::Unicode::RightToLeft)
                  m_level++;
              else if (dir == WTF::Unicode::ArabicNumber || dir == WTF::Unicode::EuropeanNumber)
                  m_level += 2;
          }
      }
  
      // BidiCharacterRun are allocated out of the rendering partition.
      PLATFORM_EXPORT void* operator new(size_t);
      PLATFORM_EXPORT void operator delete(void*);
  
      int start() const { return m_start; }
      int stop() const { return m_stop; }
      unsigned char level() const { return m_level; }
      bool reversed() const { return m_level % 2; }
      bool dirOverride() { return m_override; }
      TextDirection direction() const { return reversed() ? RTL : LTR; }
  
      BidiCharacterRun* next() const { return m_next; }
      void setNext(BidiCharacterRun* next) { m_next = next; }
  
      // Do not add anything apart from bitfields until after m_next. See https://bugs.webkit.org/show_bug.cgi?id=100173
      bool m_override : 1;
      bool m_hasHyphen : 1; // Used by BidiRun subclass which is a layering violation but enables us to save 8 bytes per object on 64-bit.
      bool m_hasAddedEllipsis : 1;
      unsigned char m_level;
      BidiCharacterRun* m_next;
      int m_start;
      int m_stop;
  };
  
  } // namespace blink
  
  #endif  // SKY_ENGINE_PLATFORM_TEXT_BIDICHARACTERRUN_H_
  