Computes the logical and ink extents of layout in device units.
This function just calls pango_layout_get_extents() followed by
two pango_extents_to_pixels() calls, rounding ink_rect and logical_rect
such that the rounded rectangles fully contain the unrounded one (that is,
passes them as first argument to pango_extents_to_pixels()).
Computes the logical and ink extents of layout in device units. This function just calls pango_layout_get_extents() followed by two pango_extents_to_pixels() calls, rounding ink_rect and logical_rect such that the rounded rectangles fully contain the unrounded one (that is, passes them as first argument to pango_extents_to_pixels()).