subfont

type Data interface {
	// Advance returns the advance for the i-th glyph.
	Advance(i int) int

	// Glyph returns the data of the i-th glyph. The returned image is valid
	// until the next Glyph call.
	Glyph(i int) (img image.Image, origin image.Point, advance int)
}

type Face struct {
	Height   int16      // interline spacing (sumarizes all subfonts)
	Ascent   int16      // height above the baseline (sumarizes all subfonts)
	Subfonts []*Subfont // ordered subfonts that make up the face
	Loader   Loader     // used to load missing subfonts
}

type Loader interface {
	Load(r rune, current []*Subfont) (containing *Subfont, updated []*Subfont)
}

type Subfont struct {
	First  rune // first character in the subfont
	Last   rune // last character in the subfont
	Offset int  // offset in Data to the first character
	Data   Data // character data
}