OC Bitmap Font format (.ocbf)

API

• ocbf.load(path: string): table, string.
  Loads a font. Returns nil and the reason if an error occured.
• `ocbf.drawchar(set: function(x: number, y: number, v: number),

             font: table, size: number, char: string, x: number, y: number)`.

  Draws a single character at (x; y) calling set function for every pixel,
  where v is either 1 or 0.
• `ocbf.draw(set: function(x: number, y: number, v: number),

         font: table, size: number, str: string, x: number, y: number)`.

  Draws a string at (x; y) calling set function for every pixel,
  where v is either 1 or 0.
• ocbf.width(font: table, size: number, str: string): number.
  Returns string width in pixels.
• font.family. Font family (i.e. Ubuntu)
• font.style. Font style (i.e. Regular)

Format Specification

[ocbf]
[[len: u8-be]
 [family: utf8 string of *len]]
[[len: u8-be]
 [style: utf8 string of *len]]
[[char: utf8 single char]
 [size: u8-be]
 [width: u8-be]
 [bitmap: ceil(size * width / 8)]]*