cvx_text.hpp

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// SPDX-FileCopyrightText: 2025 Povl Filip Sonne-Frederiksen
//
// SPDX-License-Identifier: GPL-3.0-or-later
 
#pragma once
#include <opencv2/opencv.hpp>
 
#include <map>
#include <string>
#include <vector>
 
// FreeType headers
#include <ft2build.h>
#include FT_FREETYPE_H
 
namespace reusex::vision::osd {

class CvxText {
    public:
  explicit CvxText(const char *font_path);
 
  virtual ~CvxText();

  void putText(cv::Mat &img, const std::string &text, cv::Point org,
               cv::Scalar color, int font_size);

  void getTextSize(const std::string &text, int font_size, int *w, int *h,
                   int *baseline);
 
    private:
  CvxText(const CvxText &) = delete;
  CvxText &operator=(const CvxText &) = delete;

  FT_Face getFace(const char *font_path);

  void utf8_to_ucs4(const std::string &str, std::vector<long> &ucs4);
 
    private:
  FT_Library m_library;
  std::map<std::string, FT_Face> m_faces;
};
 
} // namespace reusex::vision::osd