/*
 * Copyright (C) 2003, 2006, 2008, 2011 Apple Inc. All rights reserved.
 * Copyright (C) 2008 Holger Hans Peter Freyther
 * Copyright (C) 2014 Google Inc. All rights 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 SimpleShaper_h
#define SimpleShaper_h

#include "platform/PlatformExport.h"
#include "platform/fonts/shaping/Shaper.h"
#include "platform/geometry/FloatPoint.h"
#include "platform/geometry/FloatRect.h"
#include "platform/text/TextRun.h"
#include "wtf/HashSet.h"
#include "wtf/text/Unicode.h"

namespace blink {

class Font;
class GlyphBuffer;
class SimpleFontData;
class TextRun;
struct GlyphData;

struct PLATFORM_EXPORT SimpleShaper : public Shaper {
 public:
  SimpleShaper(const Font*,
               const TextRun&,
               const GlyphData* emphasisData = nullptr,
               HashSet<const SimpleFontData*>* fallbackFonts = nullptr,
               FloatRect* = nullptr);

  // TODO(sk.kumar): This function should be updated to take an unsigned value,
  // and callers should be updated to not pass negative values.
  // See: crbug.com/540047.
  unsigned advance(int to, GlyphBuffer* = 0);
  bool advanceOneCharacter(float& width);

  const TextRun& run() const { return m_textRun; }
  float runWidthSoFar() const { return m_runWidthSoFar; }
  unsigned currentOffset() { return m_currentCharacter; }

 private:
  unsigned m_currentCharacter;
  float m_runWidthSoFar;

  struct CharacterData {
    STACK_ALLOCATED();
    UChar32 character;
    unsigned clusterLength;
    int characterOffset;
  };

  GlyphData glyphDataForCharacter(CharacterData&, bool normalizeSpace = false);
  float characterWidth(UChar32, const GlyphData&) const;
  float adjustSpacing(float, const CharacterData&);

  template <typename TextIterator>
  unsigned advanceInternal(TextIterator&, GlyphBuffer*);
};

}  // namespace blink

#endif