text: #ifndef IMAGE_TO_SPECTRUM_H
  #define IMAGE_TO_SPECTRUM_H
  
  typedef struct rendering {
  	unsigned char attribute;
  	unsigned char ink[4];
  	unsigned char paper[4];
  	float threshold_map[4][4][3];
  	char bitmap[8][8];
  } st_rendering;
  
  typedef struct converter_data {
  	st_rendering renderings[56];
  	int rendering_count;
  	int (*dither_map)[4][4];
  	int dither_map_size;
  } st_converter_data;
  
  void image_to_spectrum_converter_init(st_converter_data *convdata, int use_colour, int dither_map_size);
  void image_to_spectrum_convert(st_converter_data *convdata, unsigned char *image_data, unsigned char *zx_data);
  
  #endif /* IMAGE_TO_SPECTRUM_H */
  