https://github.com/dhepper/font8x8

8x8 monochrome bitmap fonts for rendering
https://github.com/dhepper/font8x8

Last synced: 3 months ago
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8x8 monochrome bitmap fonts for rendering

• Host: GitHub
• URL: https://github.com/dhepper/font8x8
• Owner: dhepper
• Created: 2012-02-12T10:25:50.000Z (almost 13 years ago)
• Default Branch: master
• Last Pushed: 2023-07-27T15:58:57.000Z (over 1 year ago)
• Last Synced: 2024-08-03T01:37:49.679Z (6 months ago)
• Language: Objective-C
• Homepage:
• Size: 17.6 KB
• Stars: 518
• Watchers: 21
• Forks: 72
• Open Issues: 4
• Metadata Files:
  • Readme: README

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README

        
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 

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

;