Font.hpp

// Copyright 2019 Arthur Sonzogni. All rights reserved.
// Use of this source code is governed by the MIT license that can be found in
// the LICENSE file.
 
#ifndef SMK_FONT_HPP
#define SMK_FONT_HPP
 
#include <glm/glm.hpp>
#include <map>
#include <memory>
#include <smk/OpenGL.hpp>
#include <smk/Texture.hpp>
#include <string>
#include <vector>
 
namespace smk {
 
class Font {
 public:
  Font() = default;  // Empty font.
  Font(std::string filename, float line_height);
 
  float line_height() const { return line_height_; }
  float baseline_position() const { return baseline_position_; }
 
  struct Glyph {
    smk::Texture texture;
    glm::ivec2 bearing = {0, 0};  // Offset from baseline to left/top of glyph
    float advance = 0;            // Offset to advance to next glyph
  };
  Glyph* FetchGlyph(wchar_t in);
 
  // --- Move only resource ----------------------------------------------------
  Font(Font&&) = default;
  Font(const Font&) = delete;
  Font& operator=(Font&&) noexcept;
  Font& operator=(const Font&) = delete;
  // ---------------------------------------------------------------------------
 
 private:
  void LoadGlyphs(const std::vector<wchar_t>& chars);
 
  std::map<wchar_t, std::unique_ptr<Glyph>> glyphs_;
  std::string filename_;
  float line_height_ = 0.f;
  float baseline_position_ = 0.f;
};
 
}  // namespace smk
 
#endif /* end of include guard: SMK_FONT_HPP */