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use Result;
use compound::{HorizontalHeader, MaximumProfile};
use tape::{Tape, Value};
define_table! {
#[doc = "Horizontal metrics."]
pub HorizontalMetrics {
hMetrics (Vec<LongHorizontalMetric>),
leftSideBearing (Vec<i16> ),
}
}
table! {
#[doc = "A record of horizontal metrics."]
#[derive(Copy)]
pub LongHorizontalMetric {
advanceWidth (u16),
lsb (i16),
}
}
impl HorizontalMetrics {
pub fn read<T: Tape>(tape: &mut T, header: &HorizontalHeader, profile: &MaximumProfile)
-> Result<Self> {
let metrics = header.numberOfHMetrics as usize;
let glyphs = profile.glyphs();
debug_assert!(metrics <= glyphs);
let bearings = glyphs - metrics;
let mut table = HorizontalMetrics {
hMetrics: Vec::with_capacity(metrics),
leftSideBearing: Vec::with_capacity(bearings),
};
for _ in 0..metrics {
table.hMetrics.push(try!(Value::read(tape)));
}
for _ in 0..bearings {
table.leftSideBearing.push(try!(Value::read(tape)));
}
Ok(table)
}
}