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use crate::parser::{Stream, LazyArray};
use crate::{Font, TableName, GlyphId, HorizontalMetrics, Result, Error};
use crate::raw::hmtx as raw;
impl<'a> Font<'a> {
pub fn glyph_hor_metrics(&self, glyph_id: GlyphId) -> Result<HorizontalMetrics> {
self.check_glyph_id(glyph_id)?;
let data = self.hmtx.ok_or_else(|| Error::TableMissing(TableName::HorizontalMetrics))?;
let mut s = Stream::new(data);
let number_of_hmetrics = self.number_of_hmetrics();
if number_of_hmetrics == 0 {
return Err(Error::NoHorizontalMetrics);
}
let glyph_id = glyph_id.0;
let array: LazyArray<raw::HorizontalMetrics> = s.read_array(number_of_hmetrics)?;
if let Some(metrics) = array.get(glyph_id) {
Ok(HorizontalMetrics {
advance: metrics.advance_width(),
left_side_bearing: metrics.lsb(),
})
} else {
if self.number_of_glyphs() < number_of_hmetrics {
return Err(Error::NoHorizontalMetrics);
}
let count = self.number_of_glyphs() - number_of_hmetrics;
let left_side_bearings: LazyArray<i16> = s.read_array(count)?;
let left_side_bearing = left_side_bearings.get(glyph_id)
.ok_or_else(|| Error::NoHorizontalMetrics)?;
let last_metric = array.last().ok_or_else(|| Error::NoHorizontalMetrics)?;
Ok(HorizontalMetrics {
advance: last_metric.advance_width(),
left_side_bearing,
})
}
}
}