Trait LayoutTableExt

pub trait LayoutTableExt {
    // Required methods
    fn select_script(
        &self,
        script_tags: &[hb_tag_t],
    ) -> Option<(bool, ScriptIndex, hb_tag_t)>;
    fn select_script_language(
        &self,
        script_index: ScriptIndex,
        lang_tags: &[hb_tag_t],
    ) -> Option<LanguageIndex>;
    fn get_required_language_feature(
        &self,
        script_index: ScriptIndex,
        lang_index: Option<LanguageIndex>,
    ) -> Option<(FeatureIndex, hb_tag_t)>;
    fn find_language_feature(
        &self,
        script_index: ScriptIndex,
        lang_index: Option<LanguageIndex>,
        feature_tag: hb_tag_t,
    ) -> Option<FeatureIndex>;
}

Required Methods

fn select_script( &self, script_tags: &[hb_tag_t], ) -> Option<(bool, ScriptIndex, hb_tag_t)>

fn select_script_language( &self, script_index: ScriptIndex, lang_tags: &[hb_tag_t], ) -> Option<LanguageIndex>

fn get_required_language_feature( &self, script_index: ScriptIndex, lang_index: Option<LanguageIndex>, ) -> Option<(FeatureIndex, hb_tag_t)>

fn find_language_feature( &self, script_index: ScriptIndex, lang_index: Option<LanguageIndex>, feature_tag: hb_tag_t, ) -> Option<FeatureIndex>

Implementations on Foreign Types

impl LayoutTableExt for LayoutTable<'_>

fn select_script( &self, script_tags: &[hb_tag_t], ) -> Option<(bool, ScriptIndex, hb_tag_t)>

Returns true + index and tag of the first found script tag in the given GSUB or GPOS table or false + index and tag if falling back to a default script.

fn select_script_language( &self, script_index: ScriptIndex, lang_tags: &[hb_tag_t], ) -> Option<LanguageIndex>

Returns the index of the first found language tag in the given GSUB or GPOS table, underneath the specified script index.

fn get_required_language_feature( &self, script_index: ScriptIndex, lang_index: Option<LanguageIndex>, ) -> Option<(FeatureIndex, hb_tag_t)>

Returns the index and tag of a required feature in the given GSUB or GPOS table, underneath the specified script and language.

fn find_language_feature( &self, script_index: ScriptIndex, lang_index: Option<LanguageIndex>, feature_tag: hb_tag_t, ) -> Option<FeatureIndex>

Returns the index of a given feature tag in the given GSUB or GPOS table, underneath the specified script and language.

Implementors