text: /**
   * @file lv_draw_label.h
   *
   */
  
  #ifndef LV_DRAW_LABEL_H
  #define LV_DRAW_LABEL_H
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  /*********************
   *      INCLUDES
   *********************/
  #include "lv_draw.h"
  
  /*********************
   *      DEFINES
   *********************/
  #define LV_DRAW_LABEL_NO_TXT_SEL (0xFFFF)
  
  /**********************
   *      TYPEDEFS
   **********************/
  
  typedef struct
  {
      uint16_t start;
      uint16_t end;
  }lv_draw_label_txt_sel_t;
  
  
  /** Store some info to speed up drawing of very large texts
   * It takes a lot of time to get the first visible character because
   * all the previous characters needs to be checked to calculate the positions.
   * This structure stores an earlier (e.g. at -1000 px) coordinate and the index of that line.
   * Therefore the calculations can start from here.*/
  typedef struct {
      /** Index of the line at `y` coordinate*/
      int32_t line_start;
  
      /** Give the `y` coordinate of the first letter at `line start` index. Relative to the label's coordinates*/
      int32_t y;
  
      /** The 'y1' coordinate of the label when the hint was saved.
       * Used to invalidate the hint if the label has moved too much. */
      int32_t coord_y;
  }lv_draw_label_hint_t;
  
  /**********************
   * GLOBAL PROTOTYPES
   **********************/
  
  /**
   * Write a text
   * @param coords coordinates of the label
   * @param mask the label will be drawn only in this area
   * @param style pointer to a style
   * @param opa_scale scale down all opacities by the factor
   * @param txt 0 terminated text to write
   * @param flag settings for the text from 'txt_flag_t' enum
   * @param offset text offset in x and y direction (NULL if unused)
   * @param sel_start start index of selected area (`LV_LABEL_TXT_SEL_OFF` if none)
   */
  void lv_draw_label(const lv_area_t * coords, const lv_area_t * mask, const lv_style_t * style, lv_opa_t opa_scale,
                     const char * txt, lv_txt_flag_t flag, lv_point_t * offset, lv_draw_label_txt_sel_t * sel,
                     lv_draw_label_hint_t * hint);
  
  /**********************
   *      MACROS
   **********************/
  
  #ifdef __cplusplus
  } /* extern "C" */
  #endif
  
  #endif /*LV_DRAW_LABEL_H*/
  