Search code examples
fontsunicode-string

Understanding Font header file used in MCU code


There is font file in MCU code and it is used to display the text on LED martrix display.

I want to understand the contains of below code char widths, font data, first char, char count etc.. How the code is using these? My ultimate objective is to display language other than english....

/**********************************************************

 * File Name           : Arial_black_16.h
 * Date                : 10.01.2012
 * Font size in bytes  : 12422
 * Font width          : 10
 * Font height         : 16
 * Font first char     : 32
 * Font last char      : 128
 * Font used chars     : 96
 *
 * The font data are defined as
 *
 * struct _FONT_ {
 *     uint16_t   font_Size_in_Bytes_over_all_included_Size_it_self;
 *     uint8_t    font_Width_in_Pixel_for_fixed_drawing;
 *     uint8_t    font_Height_in_Pixel_for_all_characters;
 *     unit8_t    font_First_Char;
 *     uint8_t    font_Char_Count;
 *
 *     uint8_t    font_Char_Widths[font_Last_Char - font_First_Char +1];
 *                  // for each character the separate width in pixels,
 *                  // characters < 128 have an implicit virtual right empty row
 *
 *     uint8_t    font_data[];
 *                  // bit field of all characters
 */

#include <inttypes.h>
//#include <avr/pgmspace.h>

#ifndef ARIAL_BLACK_16_H
#define ARIAL_BLACK_16_H

#define ARIAL_BLACK_16_WIDTH 10
#define ARIAL_BLACK_16_HEIGHT 16

const static uint8_t Arial_Black_16[]  = {
    0x30, 0x86, // size
    0x0A, // width
    0x10, // height
    0x20, // first char
    0x60, // char count
    
    // char widths
    0x00, 0x03, 0x07, 0x0B, 0x09, 0x0E, 0x0B, 0x03, 0x05, 0x05, 
    0x06, 0x09, 0x03, 0x05, 0x03, 0x04, 0x08, 0x06, 0x08, 0x08, 
    0x09, 0x08, 0x08, 0x08, 0x08, 0x08, 0x03, 0x03, 0x09, 0x08, 
    0x09, 0x08, 0x0C, 0x0C, 0x09, 0x09, 0x09, 0x09, 0x08, 0x0A, 
    0x0A, 0x03, 0x09, 0x0C, 0x08, 0x0C, 0x0A, 0x0A, 0x09, 0x0A, 
    0x0A, 0x09, 0x0B, 0x0A, 0x0C, 0x10, 0x0C, 0x0B, 0x09, 0x05, 
    0x04, 0x05, 0x08, 0x08, 0x03, 0x09, 0x09, 0x09, 0x09, 0x09, 
    0x06, 0x09, 0x09, 0x03, 0x04, 0x0A, 0x03, 0x0D, 0x09, 0x09, 
    0x09, 0x09, 0x06, 0x08, 0x06, 0x09, 0x09, 0x0F, 0x0B, 0x09, 
    0x07, 0x06, 0x02, 0x06, 0x09, 0x08, 
    
    // font data
    0xFE, 0xFE, 0xFE, 0x1D, 0x1D, 0x1D, // 33
    0x1E, 0x1E, 0x1E, 0x00, 0x1E, 0x1E, 0x1E, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 34
    0x30, 0x30, 0xF0, 0xFE, 0x3E, 0x30, 0x30, 0xF0, 0xFE, 0x3E, 0x30, 0x06, 0x1E, 0x1F, 0x07, 0x06, 0x06, 0x1E, 0x1F, 0x07, 0x06, 0x06, // 35
    0x38, 0x7C, 0xFE, 0xE6, 0xFF, 0xC6, 0xCE, 0x8C, 0x0C, 0x04, 0x0C, 0x1C, 0x18, 0x3F, 0x19, 0x1F, 0x0F, 0x07, // 36
    0x3C, 0x7E, 0x42, 0x42, 0x7E, 0x3C, 0x80, 0x60, 0x10, 0x8C, 0x82, 0x80, 0x80, 0x00, 0x00, 0x00, 0x00, 0x10, 0x0C, 0x02, 0x01, 0x00, 0x0F, 0x1F, 0x10, 0x10, 0x1F, 0x0F, // 37
    0x00, 0x80, 0x9C, 0xFE, 0xFE, 0xE6, 0xBE, 0x3E, 0x9C, 0x80, 0x80, 0x07, 0x0F, 0x1F, 0x19, 0x18, 0x19, 0x1F, 0x0F, 0x0F, 0x1F, 0x1D, // 38
    0x1E, 0x1E, 0x1E, 0x00, 0x00, 0x00, // 39
    0xE0, 0xF8, 0xFC, 0x1E, 0x02, 0x0F, 0x3F, 0x7F, 0xF0, 0x80, // 40
    0x02, 0x1E, 0xFC, 0xF8, 0xE0, 0x80, 0xF0, 0x7F, 0x3F, 0x0F, // 41
    0x08, 0x68, 0x3E, 0x3E, 0x68, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 42
    0xC0, 0xC0, 0xC0, 0xF8, 0xF8, 0xF8, 0xC0, 0xC0, 0xC0, 0x01, 0x01, 0x01, 0x0F, 0x0F, 0x0F, 0x01, 0x01, 0x01, // 43
    0x00, 0x00, 0x00, 0xDC, 0x7C, 0x3C, // 44
    0x80, 0x80, 0x80, 0x80, 0x80, 0x03, 0x03, 0x03, 0x03, 0x03, // 45
    0x00, 0x00, 0x00, 0x1C, 0x1C, 0x1C, // 46
    0x00, 0x80, 0x78, 0x06, 0x18, 0x07, 0x00, 0x00, // 47
    0xF8, 0xFC, 0xFE, 0x06, 0x06, 0xFE, 0xFC, 0xF8, 0x07, 0x0F, 0x1F, 0x18, 0x18, 0x1F, 0x0F, 0x07, // 48
    0x60, 0x70, 0x38, 0xFE, 0xFE, 0xFE, 0x00, 0x00, 0x00, 0x1F, 0x1F, 0x1F, // 49
    0x18, 0x1C, 0x1E, 0x06, 0x86, 0xFE, 0xFC, 0x78, 0x18, 0x1C, 0x1E, 0x1F, 0x1B, 0x19, 0x18, 0x18, // 50
    0x08, 0x1C, 0x1E, 0xC6, 0xC6, 0xFE, 0xFC, 0x38, 0x06, 0x0E, 0x1E, 0x18, 0x18, 0x1F, 0x0F, 0x07, // 51
    0x80, 0xC0, 0xF0, 0x38, 0x1C, 0xFE, 0xFE, 0xFE, 0x00, 0x03, 0x03, 0x03, 0x03, 0x03, 0x1F, 0x1F, 0x1F, 0x03, // 52
    0xF0, 0xFE, 0xFE, 0x66, 0x66, 0xE6, 0xC6, 0x86, 0x06, 0x0E, 0x1E, 0x18, 0x18, 0x1F, 0x0F, 0x07, // 53
    0xF0, 0xFC, 0xFE, 0x46, 0x66, 0xEE, 0xCE, 0x8C, 0x03, 0x0F, 0x1F, 0x18, 0x18, 0x1F, 0x0F, 0x07, // 54
    0x06, 0x06, 0x06, 0x86, 0xE6, 0xF6, 0x1E, 0x06, 0x00, 0x00, 0x1C, 0x1F, 0x1F, 0x01, 0x00, 0x00, // 55
    0x38, 0xFC, 0xFE, 0xC6, 0xC6, 0xFE, 0xFC, 0x38, 0x07, 0x0F, 0x1F, 0x18, 0x18, 0x1F, 0x0F, 0x07, // 56
    0x78, 0xFC, 0xFE, 0x86, 0x86, 0xFE, 0xFC, 0xF0, 0x04, 0x0C, 0x1D, 0x19, 0x18, 0x1F, 0x0F, 0x03, // 57
    0x70, 0x70, 0x70, 0x1C, 0x1C, 0x1C, // 58
    0x70, 0x70, 0x70, 0xDC, 0x7C, 0x3C, // 59
    0xE0, 0xE0, 0xE0, 0xF0, 0x70, 0x70, 0x70, 0x38, 0x38, 0x03, 0x03, 0x03, 0x07, 0x07, 0x07, 0x07, 0x0E, 0x0E, // 60
    0x70, 0x70, 0x70, 0x70, 0x70, 0x70, 0x70, 0x70, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, // 61
    0x38, 0x38, 0x70, 0x70, 0x70, 0xF0, 0xE0, 0xE0, 0xE0, 0x0E, 0x0E, 0x07, 0x07, 0x07, 0x07, 0x03, 0x03, 0x03, // 62
    0x18, 0x1C, 0x9E, 0xC6, 0xE6, 0xFE, 0x7C, 0x38, 0x00, 0x00, 0x1D, 0x1D, 0x1D, 0x00, 0x00, 0x00, // 63
    0xE0, 0x18, 0xC4, 0xF4, 0x3A, 0x0A, 0x0A, 0xF2, 0xFA, 0x7C, 0x08, 0xF0, 0x07, 0x18, 0x27, 0x2F, 0x48, 0x48, 0x4C, 0x4F, 0x4F, 0x28, 0x36, 0x11, // 64
    0x00, 0x80, 0xE0, 0xF8, 0xFE, 0x1E, 0xFE, 0xF8, 0xE0, 0x80, 0x00, 0x00, 0x1C, 0x1F, 0x0F, 0x07, 0x06, 0x06, 0x06, 0x07, 0x0F, 0x1F, 0x1C, 0x10, // 65
    0xFE, 0xFE, 0xFE, 0xC6, 0xC6, 0xFE, 0xBC, 0x98, 0x00, 0x1F, 0x1F, 0x1F, 0x18, 0x18, 0x18, 0x1F, 0x0F, 0x07, // 66
    0xF0, 0xFC, 0xFC, 0x0E, 0x06, 0x0E, 0x1E, 0x1C, 0x08, 0x03, 0x0F, 0x1F, 0x1C, 0x18, 0x1C, 0x1F, 0x0E, 0x06, // 67
    0xFE, 0xFE, 0xFE, 0x06, 0x06, 0x0E, 0xFE, 0xFC, 0xF0, 0x1F, 0x1F, 0x1F, 0x18, 0x18, 0x1C, 0x1F, 0x0F, 0x03, // 68
    0xFE, 0xFE, 0xFE, 0xC6, 0xC6, 0xC6, 0xC6, 0xC6, 0x06, 0x1F, 0x1F, 0x1F, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, // 69
    0xFE, 0xFE, 0xFE, 0xC6, 0xC6, 0xC6, 0xC6, 0x06, 0x1F, 0x1F, 0x1F, 0x00, 0x00, 0x00, 0x00, 0x00, // 70
    0xF0, 0xFC, 0xFC, 0x0E, 0x06, 0xC6, 0xCE, 0xDE, 0xDC, 0xC8, 0x03, 0x0F, 0x0F, 0x1C, 0x18, 0x18, 0x1C, 0x1F, 0x0F, 0x0F, // 71
    0xFE, 0xFE, 0xFE, 0xC0, 0xC0, 0xC0, 0xC0, 0xFE, 0xFE, 0xFE, 0x1F, 0x1F, 0x1F, 0x00, 0x00, 0x00, 0x00, 0x1F, 0x1F, 0x1F, // 72
    0xFE, 0xFE, 0xFE, 0x1F, 0x1F, 0x1F, // 73
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFE, 0xFE, 0xFE, 0x06, 0x0F, 0x1F, 0x1C, 0x18, 0x18, 0x1F, 0x0F, 0x07, // 74
    0xFE, 0xFE, 0xFE, 0xC0, 0xE0, 0xF0, 0xF8, 0xDC, 0x0E, 0x06, 0x02, 0x00, 0x1F, 0x1F, 0x1F, 0x00, 0x00, 0x00, 0x01, 0x07, 0x1F, 0x1E, 0x18, 0x10, // 75
    0xFE, 0xFE, 0xFE, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1F, 0x1F, 0x1F, 0x18, 0x18, 0x18, 0x18, 0x18, // 76
    0xFE, 0xFE, 0xFE, 0x3E, 0xF8, 0x80, 0x80, 0xF8, 0x3E, 0xFE, 0xFE, 0xFE, 0x1F, 0x1F, 0x1F, 0x00, 0x03, 0x1F, 0x1F, 0x03, 0x00, 0x1F, 0x1F, 0x1F, // 77
    0xFE, 0xFE, 0xFE, 0x7C, 0xF0, 0xE0, 0x80, 0xFE, 0xFE, 0xFE, 0x1F, 0x1F, 0x1F, 0x00, 0x01, 0x03, 0x0F, 0x1F, 0x1F, 0x1F, // 78
    0xF0, 0xFC, 0xFC, 0x0E, 0x06, 0x06, 0x0E, 0xFC, 0xFC, 0xF0, 0x03, 0x0F, 0x0F, 0x1C, 0x18, 0x18, 0x1C, 0x0F, 0x0F, 0x03, // 79
    0xFE, 0xFE, 0xFE, 0xC6, 0xC6, 0xC6, 0xFE, 0x7E, 0x3C, 0x1F, 0x1F, 0x1F, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 80
    0xF0, 0xFC, 0xFC, 0x0E, 0x06, 0x06, 0x0E, 0xFC, 0xFC, 0xF0, 0x03, 0x0F, 0x0F, 0x1C, 0x18, 0x1E, 0x1C, 0x1F, 0x1F, 0x33, // 81
    0xFE, 0xFE, 0xFE, 0xC6, 0xC6, 0xC6, 0xFE, 0x7E, 0x3C, 0x00, 0x1F, 0x1F, 0x1F, 0x00, 0x00, 0x03, 0x0F, 0x1F, 0x1C, 0x10, // 82
    0x38, 0x7C, 0xFE, 0xE6, 0xE6, 0xEE, 0xDE, 0xDC, 0x98, 0x06, 0x0E, 0x1E, 0x1C, 0x18, 0x19, 0x1F, 0x0F, 0x07, // 83
    0x06, 0x06, 0x06, 0x06, 0xFE, 0xFE, 0xFE, 0x06, 0x06, 0x06, 0x06, 0x00, 0x00, 0x00, 0x00, 0x1F, 0x1F, 0x1F, 0x00, 0x00, 0x00, 0x00, // 84
    0xFE, 0xFE, 0xFE, 0x00, 0x00, 0x00, 0x00, 0xFE, 0xFE, 0xFE, 0x07, 0x0F, 0x1F, 0x1C, 0x18, 0x18, 0x1C, 0x1F, 0x0F, 0x07, // 85
    0x1E, 0xFE, 0xFC, 0xF0, 0x80, 0x00, 0x80, 0xF0, 0xFC, 0xFE, 0x1E, 0x02, 0x00, 0x00, 0x03, 0x1F, 0x1F, 0x1C, 0x1F, 0x1F, 0x03, 0x00, 0x00, 0x00, // 86
    0xFE, 0xFE, 0xF8, 0x00, 0x80, 0xF8, 0xFE, 0x3E, 0xFE, 0xF8, 0x80, 0x00, 0xF8, 0xFE, 0xFE, 0x06, 0x00, 0x0F, 0x1F, 0x1F, 0x1F, 0x07, 0x01, 0x00, 0x01, 0x07, 0x1F, 0x1F, 0x1F, 0x0F, 0x00, 0x00, // 87
    0x06, 0x1E, 0x3C, 0xF8, 0xF0, 0xE0, 0xF0, 0xF8, 0x3C, 0x1E, 0x06, 0x02, 0x18, 0x1E, 0x0F, 0x07, 0x03, 0x01, 0x03, 0x07, 0x0F, 0x1E, 0x18, 0x10, // 88
    0x02, 0x0E, 0x1E, 0x7E, 0xF8, 0xE0, 0xF8, 0x7E, 0x1E, 0x0E, 0x02, 0x00, 0x00, 0x00, 0x00, 0x1F, 0x1F, 0x1F, 0x00, 0x00, 0x00, 0x00, // 89
    0x00, 0x06, 0x06, 0xC6, 0xE6, 0xF6, 0x3E, 0x1E, 0x0E, 0x1C, 0x1E, 0x1F, 0x1B, 0x19, 0x18, 0x18, 0x18, 0x18, // 90
    0xFE, 0xFE, 0xFE, 0x06, 0x06, 0xFF, 0xFF, 0xFF, 0xC0, 0xC0, // 91
    0x06, 0x78, 0x80, 0x00, 0x00, 0x00, 0x07, 0x18, // 92
    0x06, 0x06, 0xFE, 0xFE, 0xFE, 0xC0, 0xC0, 0xFF, 0xFF, 0xFF, // 93
    0x40, 0x70, 0x7C, 0x1E, 0x1E, 0x7C, 0x70, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 94
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, // 95
    0x02, 0x06, 0x04, 0x00, 0x00, 0x00, // 96
    0x40, 0x60, 0x70, 0x30, 0xB0, 0xB0, 0xF0, 0xF0, 0xE0, 0x0E, 0x1F, 0x1F, 0x1B, 0x19, 0x09, 0x1F, 0x1F, 0x1F, // 97
    0xFE, 0xFE, 0xFE, 0x60, 0x30, 0x30, 0xF0, 0xE0, 0xC0, 0x1F, 0x1F, 0x1F, 0x0C, 0x18, 0x18, 0x1F, 0x0F, 0x07, // 98
    0xC0, 0xE0, 0xF0, 0x70, 0x30, 0x30, 0x70, 0x60, 0x40, 0x07, 0x0F, 0x1F, 0x1C, 0x18, 0x18, 0x1C, 0x0C, 0x04, // 99
    0xC0, 0xE0, 0xF0, 0x30, 0x30, 0x60, 0xFE, 0xFE, 0xFE, 0x07, 0x0F, 0x1F, 0x18, 0x18, 0x0C, 0x1F, 0x1F, 0x1F, // 100
    0xC0, 0xE0, 0xF0, 0xB0, 0xB0, 0xB0, 0xF0, 0xE0, 0xC0, 0x07, 0x0F, 0x1F, 0x1D, 0x19, 0x19, 0x1D, 0x0D, 0x05, // 101
    0x30, 0xFC, 0xFE, 0xFE, 0x36, 0x36, 0x00, 0x1F, 0x1F, 0x1F, 0x00, 0x00, // 102
    0xC0, 0xE0, 0xF0, 0x30, 0x30, 0x60, 0xF0, 0xF0, 0xF0, 0x47, 0xCF, 0xDF, 0xD8, 0xD8, 0xCC, 0xFF, 0x7F, 0x3F, // 103
    0xFE, 0xFE, 0xFE, 0x20, 0x30, 0x30, 0xF0, 0xF0, 0xE0, 0x1F, 0x1F, 0x1F, 0x00, 0x00, 0x00, 0x1F, 0x1F, 0x1F, // 104
    0xF6, 0xF6, 0xF6, 0x1F, 0x1F, 0x1F, // 105
    0x00, 0xF6, 0xF6, 0xF6, 0xC0, 0xFF, 0xFF, 0x7F, // 106
    0xFE, 0xFE, 0xFE, 0xC0, 0xE0, 0xF0, 0xF0, 0x30, 0x10, 0x00, 0x1F, 0x1F, 0x1F, 0x03, 0x01, 0x07, 0x1F, 0x1E, 0x1C, 0x10, // 107
    0xFE, 0xFE, 0xFE, 0x1F, 0x1F, 0x1F, // 108
    0xF0, 0xF0, 0xF0, 0x20, 0x30, 0xF0, 0xF0, 0xE0, 0x20, 0x30, 0xF0, 0xF0, 0xE0, 0x1F, 0x1F, 0x1F, 0x00, 0x00, 0x1F, 0x1F, 0x1F, 0x00, 0x00, 0x1F, 0x1F, 0x1F, // 109
    0xF0, 0xF0, 0xF0, 0x20, 0x30, 0x30, 0xF0, 0xF0, 0xE0, 0x1F, 0x1F, 0x1F, 0x00, 0x00, 0x00, 0x1F, 0x1F, 0x1F, // 110
    0xC0, 0xE0, 0xF0, 0x70, 0x30, 0x70, 0xF0, 0xE0, 0xC0, 0x07, 0x0F, 0x1F, 0x1C, 0x18, 0x1C, 0x1F, 0x0F, 0x07, // 111
    0xF0, 0xF0, 0xF0, 0x60, 0x30, 0x70, 0xF0, 0xE0, 0xC0, 0xFF, 0xFF, 0xFF, 0x0C, 0x18, 0x18, 0x1F, 0x0F, 0x07, // 112
    0xC0, 0xE0, 0xF0, 0x30, 0x30, 0x60, 0xF0, 0xF0, 0xF0, 0x07, 0x0F, 0x1F, 0x18, 0x18, 0x0C, 0xFF, 0xFF, 0xFF, // 113
    0xF0, 0xF0, 0xF0, 0x20, 0x30, 0x10, 0x1F, 0x1F, 0x1F, 0x00, 0x00, 0x00, // 114
    0xE0, 0xF0, 0xF0, 0x90, 0x90, 0xB0, 0x30, 0x20, 0x08, 0x19, 0x1B, 0x13, 0x13, 0x1F, 0x1F, 0x0E, // 115
    0x30, 0xFC, 0xFC, 0xFE, 0x30, 0x30, 0x00, 0x0F, 0x1F, 0x1F, 0x18, 0x18, // 116
    0xF0, 0xF0, 0xF0, 0x00, 0x00, 0x00, 0xF0, 0xF0, 0xF0, 0x0F, 0x1F, 0x1F, 0x18, 0x18, 0x08, 0x1F, 0x1F, 0x1F, // 117
    0x10, 0xF0, 0xF0, 0xC0, 0x00, 0xE0, 0xF0, 0xF0, 0x10, 0x00, 0x00, 0x07, 0x1F, 0x1C, 0x1F, 0x07, 0x00, 0x00, // 118
    0x10, 0xF0, 0xF0, 0xE0, 0x00, 0x00, 0xF0, 0xF0, 0xF0, 0x00, 0x00, 0xE0, 0xF0, 0xF0, 0x10, 0x00, 0x00, 0x07, 0x1F, 0x1E, 0x0F, 0x03, 0x00, 0x03, 0x0F, 0x1E, 0x1F, 0x07, 0x00, 0x00, // 119
    0x10, 0x30, 0x70, 0xE0, 0xC0, 0x80, 0xC0, 0xE0, 0x70, 0x30, 0x10, 0x10, 0x18, 0x1E, 0x0F, 0x07, 0x03, 0x07, 0x0F, 0x1E, 0x18, 0x10, // 120
    0x10, 0xF0, 0xF0, 0xC0, 0x00, 0xC0, 0xF0, 0xF0, 0x30, 0xC0, 0xC0, 0xC7, 0xFF, 0xFC, 0x3F, 0x0F, 0x01, 0x00, // 121
    0x30, 0x30, 0x30, 0xF0, 0xF0, 0xF0, 0x30, 0x1C, 0x1E, 0x1F, 0x1B, 0x19, 0x18, 0x18, // 122
    0x00, 0x00, 0xFC, 0xFE, 0xFE, 0x06, 0x03, 0x03, 0x7F, 0xFF, 0xFC, 0xC0, // 123
    0xFE, 0xFE, 0xFF, 0xFF, // 124
    0x06, 0xFE, 0xFE, 0xFC, 0x00, 0x00, 0xC0, 0xFC, 0xFF, 0x7F, 0x03, 0x03, // 125
    0xC0, 0xE0, 0xE0, 0xE0, 0xE0, 0xC0, 0xC0, 0xC0, 0xE0, 0x01, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x01, 0x00, // 126
    0xF8, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0xF8, 0x1F, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x1F // 127
    
};

#endif

Solution

  • Let's have a look at the entry for 50, which endodes for ASCII of '2'. Break the line for 50 into two lines:

    0x18, 0x1C, 0x1E, 0x06, 0x86, 0xFE, 0xFC, 0x78,
    0x18, 0x1C, 0x1E, 0x1F, 0x1B, 0x19, 0x18, 0x18, // 50 = '2'
    

    From left to right, the upper line encodes the upper 8 rows of the glyph, and the lower line encodes the lower 8 rows of the glyph, in the following way:

    Combine the two bytes of each column to a 16-bit litte-endian value, then bit 0 encodes the top row, bit 1 the next row, etc.

    Drawing the glyph using . for bit 0, and the nibble's value for bit 1, the picture of letter 2 will emerge:

               Bit No.
    ........     0
    ..E66E..     1
    .CE66EC.     2
    8CE..EC8     3
    111..FF7     4
    .....FF7     5
    .....FF7     6
    ....8FF.     7
    ...FB9..     8
    ..EFB...     9
    .CEF....    10
    8CEFB988    11
    11111111    12
    ........    13
    ........    14
    ........    15