PangoGravity represents the orientation of glyphs in a segment
This is useful when rendering vertical text layouts. In those situations,
the layout is rotated using a non-identity
Pango#Matrix, and then
glyph orientation is controlled using
Not every value in this enumeration makes sense for every usage of
PangoGravity; for example, %PANGO_GRAVITY_AUTO only can be passed to
Pango::Context#base_gravity= and can only be returned by
Glyphs stand upright (default)
Glyphs are rotated 90 degrees counter-clockwise.
Glyphs are upside-down.
Glyphs are rotated 90 degrees clockwise.
Gravity is resolved from the context matrix
.g_type : UInt64
Returns the type id (GType) registered in GLib type system.