pub const SCALE: i32 = ffi::PANGO_SCALE; // 1_024i32
The scale between dimensions used for Pango distances and device units.
The definition of device units is dependent on the output device; it will
typically be pixels for a screen, and points for a printer.
currently 1024, but this may be changed in the future.
When setting font sizes, device units are always considered to be points (as in “12 point font”), rather than pixels.