pub trait FontExt: IsA<Font> + Sealed + 'static {
// Provided methods
fn describe(&self) -> FontDescription { ... }
fn describe_with_absolute_size(&self) -> FontDescription { ... }
fn coverage(&self, language: &Language) -> Coverage { ... }
fn face(&self) -> FontFace { ... }
fn font_map(&self) -> Option<FontMap> { ... }
fn glyph_extents(&self, glyph: Glyph) -> (Rectangle, Rectangle) { ... }
fn metrics(&self, language: Option<&Language>) -> FontMetrics { ... }
fn has_char(&self, wc: char) -> bool { ... }
fn serialize(&self) -> Bytes { ... }
}Provided Methods§
sourcefn describe(&self) -> FontDescription
fn describe(&self) -> FontDescription
Returns a description of the font, with font size set in points.
Use describe_with_absolute_size() if you want
the font size in device units.
§Returns
a newly-allocated FontDescription object.
sourcefn describe_with_absolute_size(&self) -> FontDescription
fn describe_with_absolute_size(&self) -> FontDescription
Returns a description of the font, with absolute font size set in device units.
Use describe() if you want the font size in points.
§Returns
a newly-allocated FontDescription object.
sourcefn font_map(&self) -> Option<FontMap>
fn font_map(&self) -> Option<FontMap>
Gets the font map for which the font was created.
Note that the font maintains a weak reference to
the font map, so if all references to font map are
dropped, the font map will be finalized even if there
are fonts created with the font map that are still alive.
In that case this function will return None.
It is the responsibility of the user to ensure that the
font map is kept alive. In most uses this is not an issue
as a Context holds a reference to the font map.
§Returns
the FontMap
for the font
sourcefn glyph_extents(&self, glyph: Glyph) -> (Rectangle, Rectangle)
fn glyph_extents(&self, glyph: Glyph) -> (Rectangle, Rectangle)
Gets the logical and ink extents of a glyph within a font.
The coordinate system for each rectangle has its origin at the base line and horizontal origin of the character with increasing coordinates extending to the right and down. The macros PANGO_ASCENT(), PANGO_DESCENT(), PANGO_LBEARING(), and PANGO_RBEARING() can be used to convert from the extents rectangle to more traditional font metrics. The units of the rectangles are in 1/PANGO_SCALE of a device unit.
If @self is None, this function gracefully sets some sane values in the
output variables and returns.
§glyph
the glyph index
§Returns
§ink_rect
rectangle used to store the extents of the glyph as drawn
§logical_rect
rectangle used to store the logical extents of the glyph
sourcefn metrics(&self, language: Option<&Language>) -> FontMetrics
fn metrics(&self, language: Option<&Language>) -> FontMetrics
Gets overall metric information for a font.
Since the metrics may be substantially different for different scripts, a language tag can be provided to indicate that the metrics should be retrieved that correspond to the script(s) used by that language.
If @self is None, this function gracefully sets some sane values in the
output variables and returns.
§language
language tag used to determine which script
to get the metrics for, or None to indicate to get the metrics for
the entire font.
§Returns
a FontMetrics object. The caller must call
Pango::FontMetrics::unref() when finished using the object.
sourcefn serialize(&self) -> Bytes
Available on crate feature v1_50 only.
fn serialize(&self) -> Bytes
v1_50 only.Serializes the @self in a way that can be uniquely identified.
There are no guarantees about the format of the output across different versions of Pango.
The intended use of this function is testing, benchmarking and debugging. The format is not meant as a permanent storage format.
To recreate a font from its serialized form, use Font::deserialize().
§Returns
a GBytes containing the serialized form of @self