We're about to remove the extra padding from Editor. To do that, the
clipping must account for text drawing that lie outside the viewport.
With accurate clip bounds, use it for Label as well.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
There is now a single shaping implementation, Shaper, for all fonts, replacing
Family that only covered a single typeface.
A typeface is identified by a name, where the empty string denotes the
default typeface.
Font is introduced to specify a particular font from the typeface, style,
weight and size.
Face is changed to an interface for a particular layout and shaping method.
The text/shape package is renamed to text/opentype and contains a Face
implementation based on golang.org/x/image/font/sfnt.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
Elias Naur