Where a glyph is in the atlas and how to place it.
Fields
- advance: float
- pixels
- left: float
- pixels from the pen to the bitmap's left edge
- top: float
- pixels from the baseline up to the bitmap's top edge
- width: float
- bitmap size in pixels
- height: float
- u0: float
- v0: float
- u1: float
- v1: float
- visible: bool
- false: nothing to draw (a space)