func NewGlyphCache() *GlyphCacheImp {
	glyphs := make(map[string]map[rune]*Glyph)
	return &GlyphCacheImp {
		glyphs: glyphs,
	}
}
func NewGlyphCache() *GlyphCacheImp {
	glyphs := make(map[string]map[rune]*Glyph)
	return &GlyphCacheImp {
		glyphs: glyphs,
	}
}
// NewGlyphCache initializes a GlyphCache