include/rive/text/glyph_lookup.hpp

#ifndef _RIVE_TEXT_GLYPH_LOOKUP_HPP_
#define _RIVE_TEXT_GLYPH_LOOKUP_HPP_
#include "rive/text_engine.hpp"
#include <stdint.h>
#include <vector>

namespace rive
{

/// Stores the glyphId/Index representing the codepoint at i.
class GlyphLookup
{
public:
  void compute(Span<const Unichar> text, const SimpleArray<Paragraph>& shape);

private:
  std::vector<uint32_t> m_glyphIndices;

public:
  uint32_t count(uint32_t index) const;
  uint32_t glyphStart(uint32_t index) const;
  bool isGlyphBoundary(uint32_t index) const;
  size_t size() const { return m_glyphIndices.size(); }

  // Returns the glyph index from the computed shape given the codePointIndex
  // in the original text.
  uint32_t operator[](uint32_t codePointIndex) const
  {
    assert(
        codePointIndex >= 0 &&
        codePointIndex < (uint32_t)m_glyphIndices.size());
    return m_glyphIndices[codePointIndex];
  }

  uint32_t lastCodePointIndex() const
  {
    return m_glyphIndices.size() == 0 ? 0
                                      : (uint32_t)(m_glyphIndices.size() - 1);
  }

  bool empty() const { return m_glyphIndices.empty(); }
  void clear() { m_glyphIndices.clear(); }

  // How far this codePoint index is within the glyph.
  float advanceFactor(int32_t codePointIndex, bool inv) const;
};
} // namespace rive

#endif