dos-font8x8's Introduction

Most Significant Bit is First Pixel conversion of...

8x8 monochrome bitmap font for rendering

A collection of header files containing a 8x8 bitmap font.

font8x8.h contains all available characters font8x8_basic.h contains unicode points U+0000 - U+007F font8x8_latin.h contains unicode points U+0000 - U+00FF

Author: Daniel Hepper [email protected] License: Public Domain

Encoding

Every character in the font is encoded row-wise in 8 bytes.

The least significant bit of each byte corresponds to the first pixel in a row.

The character 'A' (0x41 / 65) is encoded as { 0x0C, 0x1E, 0x33, 0x33, 0x3F, 0x33, 0x33, 0x00}

0x0C => 0000 1100 => ..XX....
0X1E => 0001 1110 => .XXXX...
0x33 => 0011 0011 => XX..XX..
0x33 => 0011 0011 => XX..XX..
0x3F => 0011 1111 => xxxxxx..
0x33 => 0011 0011 => XX..XX..
0x33 => 0011 0011 => XX..XX..
0x00 => 0000 0000 => ........

To access the nth pixel in a row, right-shift by n.

                     . . X X . . . .
                     | | | | | | | |
(0x0C >> 0) & 1 == 0-+ | | | | | | |
(0x0C >> 1) & 1 == 0---+ | | | | | |
(0x0C >> 2) & 1 == 1-----+ | | | | |
(0x0C >> 3) & 1 == 1-------+ | | | |
(0x0C >> 4) & 1 == 0---------+ | | |
(0x0C >> 5) & 1 == 0-----------+ | |
(0x0C >> 6) & 1 == 0-------------+ |
(0x0C >> 7) & 1 == 0---------------+

Renderer

To visualize the font, a simple renderer is included in render.c

$ gcc render.c -o render
$ ./render 65
  XX    
 XXXX   
XX  XX  
XX  XX  
XXXXXX  
XX  XX  
XX  XX

Credits

These header files are directly derived from an assembler file fetched from: http://dimensionalrift.homelinux.net/combuster/mos3/?p=viewsource&file=/modules/gfx/font8_8.asm

Original header:

; Summary: font8_8.asm ; 8x8 monochrome bitmap fonts for rendering ; ; Author: ; Marcel Sondaar ; International Business Machines (public domain VGA fonts) ; ; License: ; Public Domain ;

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