pub trait VariationInfo {
type Error: Error;
// Required methods
fn axis_count(&self) -> u16;
fn axis(&self, axis_tag: Tag) -> Option<(usize, &Axis)>;
fn resolve_variable_metric(
&self,
locations: &HashMap<NormalizedLocation, i16>,
) -> Result<(i16, Vec<(VariationRegion, i16)>), Self::Error>;
fn resolve_glyphs_number_value(
&self,
name: &str,
) -> Result<HashMap<NormalizedLocation, f64>, Self::Error>;
}Expand description
A trait for providing variable font information to the compiler.
In order to compile a variable font, we need to know what axes exist, what ranges are valid, how to map from user to normalized coordinates, and potentially other things that are not part of the FEA file.
This trait abstracts over that info.
Required Associated Types§
Required Methods§
Sourcefn axis_count(&self) -> u16
fn axis_count(&self) -> u16
The number of axes in the fvar table
Sourcefn axis(&self, axis_tag: Tag) -> Option<(usize, &Axis)>
fn axis(&self, axis_tag: Tag) -> Option<(usize, &Axis)>
If the tag is an axis in this font, it’s fvar index and it’s Axis data.
Sourcefn resolve_variable_metric(
&self,
locations: &HashMap<NormalizedLocation, i16>,
) -> Result<(i16, Vec<(VariationRegion, i16)>), Self::Error>
fn resolve_variable_metric( &self, locations: &HashMap<NormalizedLocation, i16>, ) -> Result<(i16, Vec<(VariationRegion, i16)>), Self::Error>
Compute default & deltas for a set of locations and values in variation space.
On success, returns the default value for this set of locations, as well
as a set of deltas suitable for inclusing in an ItemVariationStore.
Sourcefn resolve_glyphs_number_value(
&self,
name: &str,
) -> Result<HashMap<NormalizedLocation, f64>, Self::Error>
fn resolve_glyphs_number_value( &self, name: &str, ) -> Result<HashMap<NormalizedLocation, f64>, Self::Error>
Glyphsapp only: return the [number value] for this name, if defined: