u8g2_font_render.h

/*
 * u8g2_font_render.h
 *
 *  Created on: Nov 27, 2020
 *      Author: quard
 */

#ifndef INC_U8G2_FONT_RENDER_H_
#define INC_U8G2_FONT_RENDER_H_

#include "stm32f1xx_hal.h"
#include <stdlib.h>
#include <string.h>


#define U8G2_FONT_HEADER_SIZE 23

#define U8G2FontRender_OK  0x01
#define U8G2FontRender_ERR 0x02


#define pgm_read(adr) (*(const uint8_t *)(adr))

typedef void (*fnDrawPixel)(uint8_t x, uint8_t y);

typedef struct {
  uint8_t number_of_glyphs     : 8;
  uint8_t bounding_box_mode    : 8;
  uint8_t zero_bit_width       : 8;
  uint8_t one_bit_width        : 8;

  uint8_t glyph_width          : 8;
  uint8_t glyph_height         : 8;
  uint8_t glyph_x_offset       : 8;
  uint8_t glyph_y_offset       : 8;
  uint8_t glyph_pitch          : 8;

  int8_t bounding_box_width    : 8;
  int8_t bounding_box_height   : 8;
  int8_t bounding_box_x_offset : 8;
  int8_t bounding_box_y_offset : 8;

  int8_t ascent_A              : 8;
  int8_t descent_g             : 8;
  int8_t ascent_parentheses    : 8;
  int8_t descent_parentheses   : 8;

  uint16_t offset_A            : 16;
  uint16_t offset_a            : 16;
  uint16_t offset_0x100        : 16;
} U8G2FontHeader_t;

typedef struct {
  uint8_t character   : 8;
  uint8_t next_glypth : 8;

  uint8_t width;
  uint8_t height;
  int8_t x_offset;
  int8_t y_offset;
  int8_t pitch;

  uint8_t bit_pos;
  const uint8_t *data;
} U8G2FontGlyph_t;

typedef struct {
	U8G2FontHeader_t header;

	const uint8_t *data;

	fnDrawPixel drawFgPixel;
	fnDrawPixel drawBgPixel;
} U8G2FontRender_t;


U8G2FontRender_t U8G2FontRender(const uint8_t *data, fnDrawPixel drawFgPixel, fnDrawPixel drawBgPixel);
U8G2FontHeader_t U8G2FontRender_ParseHeader(U8G2FontRender_t *font);
void U8G2FontRender_PrintChar(U8G2FontRender_t *font, uint8_t *x, uint8_t y, char chr);
void U8G2FontRender_Print(U8G2FontRender_t *font, uint8_t x, uint8_t y, char *str);


#endif /* INC_U8G2_FONT_RENDER_H_ */