how much the line advances after drawing this glyph when setting text in horizontal direction.
how much the line advances after drawing this glyph when setting text in vertical direction.
how much the glyph moves on the X-axis before drawing it, this should not affect how much the line advances.
how much the glyph moves on the Y-axis before drawing it, this should not affect how much the line advances.
Create a glyph_position.GlyphPosition boxed type.