read-fonts 0.46.0

Reading OpenType font files.
Documentation 
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//! Closure for the extended positioning formats.

use super::super::{
    CursivePosFormat2, MarkBasePosFormat2, MarkLigPosFormat2, MarkMarkPosFormat2, PairPosFormat3,
    PairPosFormat4, PairSet2, SinglePosFormat3, SinglePosFormat4,
};
use super::*;

#[cfg(test)]
mod tests;

macro_rules! intersect_coverage {
    ($table:ident) => {
        impl Intersect for $table<'_> {
            fn intersects(&self, glyphs: &IntSet<GlyphId>) -> Result<bool, ReadError> {
                if self.coverage_offset().is_null() {
                    return Ok(false);
                }
                Ok(self.coverage()?.intersects(glyphs))
            }
        }
    };
}
intersect_coverage!(SinglePosFormat3);
intersect_coverage!(SinglePosFormat4);
intersect_coverage!(CursivePosFormat2);

macro_rules! intersect_mark_coverages {
    ($table:ident, $first_offset:ident, $second_offset:ident, $first:ident, $second:ident) => {
        impl Intersect for $table<'_> {
            fn intersects(&self, glyphs: &IntSet<GlyphId>) -> Result<bool, ReadError> {
                if self.$first_offset().is_null() || self.$second_offset().is_null() {
                    return Ok(false);
                }
                Ok(self.$first()?.intersects(glyphs) && self.$second()?.intersects(glyphs))
            }
        }
    };
}
intersect_mark_coverages!(
    MarkBasePosFormat2,
    mark_coverage_offset,
    base_coverage_offset,
    mark_coverage,
    base_coverage
);
intersect_mark_coverages!(
    MarkLigPosFormat2,
    mark_coverage_offset,
    ligature_coverage_offset,
    mark_coverage,
    ligature_coverage
);
intersect_mark_coverages!(
    MarkMarkPosFormat2,
    mark1_coverage_offset,
    mark2_coverage_offset,
    mark1_coverage,
    mark2_coverage
);

impl Intersect for PairPosFormat3<'_> {
    fn intersects(&self, glyphs: &IntSet<GlyphId>) -> Result<bool, ReadError> {
        if self.coverage_offset().is_null() {
            return Ok(false);
        }
        pair_pos_intersects(
            &self.coverage()?,
            self.pair_sets(),
            self.pair_set_count().to_u32(),
            glyphs,
        )
    }
}

impl Intersect for PairSet2<'_> {
    fn intersects(&self, glyphs: &IntSet<GlyphId>) -> Result<bool, ReadError> {
        for record in self.pair_value_records().iter() {
            if glyphs.contains(GlyphId::from(record?.second_glyph())) {
                return Ok(true);
            }
        }
        Ok(false)
    }
}

impl Intersect for PairPosFormat4<'_> {
    fn intersects(&self, glyphs: &IntSet<GlyphId>) -> Result<bool, ReadError> {
        if self.coverage_offset().is_null()
            || self.class_def1_offset().is_null()
            || self.class_def2_offset().is_null()
        {
            return Ok(false);
        }
        Ok(self.coverage()?.intersects(glyphs) && self.class_def2()?.intersects(glyphs)?)
    }
}