cairo_font_extents_t.height

the recommended vertical distance between baselines when setting consecutive lines of text with the font. This is greater than @ascent+@descent by a quantity known as the <firstterm>line spacing</firstterm> or <firstterm>external leading</firstterm>. When space is at a premium, most fonts can be set with only a distance of @ascent+@descent between lines.

struct cairo_font_extents_t
double height;