/*
 * Copyright (C) 2015 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 Shaper_h
#define Shaper_h

#include "platform/PlatformExport.h"
#include "platform/geometry/FloatPoint.h"
#include "wtf/Allocator.h"
#include "wtf/HashSet.h"
#include "wtf/Noncopyable.h"

namespace blink {

class FloatRect;
class Font;
class GlyphBuffer;
class SimpleFontData;
class TextRun;

struct GlyphData;

class PLATFORM_EXPORT Shaper {
  DISALLOW_NEW();
  WTF_MAKE_NONCOPYABLE(Shaper);

 protected:
  Shaper(const Font*,
         const TextRun&,
         const GlyphData* emphasisData = nullptr,
         HashSet<const SimpleFontData*>* fallbackFonts = nullptr,
         FloatRect* = nullptr);

  void trackNonPrimaryFallbackFont(const SimpleFontData*);

  bool forTextEmphasis() const { return m_emphasisSubstitutionData; }
  void addEmphasisMark(GlyphBuffer*, float midGlyphOffset) const;

  const Font* m_font;
  const TextRun& m_textRun;
  HashSet<const SimpleFontData*>* m_fallbackFonts;
  FloatRect* m_glyphBoundingBox;

  // TODO(kojii): These are no longer used in HarfBuzzShaper.
  float m_expansion;  // Pixels to be distributed over the line at word breaks.
  float m_expansionPerOpportunity;  // Pixels to be added to each expansion
                                    // opportunity.
  bool m_isAfterExpansion;

 private:
  // Emphasis substitution info. If specified, this will be used to replace all
  // glyphs which can receive text emphasis with center-aligned emphasis glyphs.
  const GlyphData* m_emphasisSubstitutionData;
  FloatPoint m_emphasisGlyphCenter;
};

}  // namespace blink

#endif  // Shaper_h