third_party/WebKit/Source/platform/fonts/shaping/Shaper.h

/*
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#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