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mod cff;
mod hint;
pub use cff::{Glyph, GlyphSink, Cff, CffProxy};
pub use hint::HinterState;
use super::{internal, TRACE};
use crate::font::FontRef;
pub struct Scaler {
entries: Vec<Entry>,
max_entries: usize,
epoch: u64,
}
impl Scaler {
pub fn new(max_entries: usize) -> Self {
Self {
entries: Vec::new(),
max_entries,
epoch: 0,
}
}
pub fn scale(
&mut self,
font: &FontRef,
id: u64,
coords: &[i16],
proxy: &CffProxy,
scale: f32,
hint: bool,
glyph_id: u16,
sink: &mut impl GlyphSink,
) -> Option<()> {
let cff = proxy.materialize(font);
let glyph = cff.get(glyph_id)?;
if hint {
let dict = glyph.subfont_index();
let state = self.entry(id, dict, coords, scale, &glyph);
if glyph.path(scale, coords, Some(state), sink) {
Some(())
} else {
None
}
} else {
if glyph.path(scale, coords, None, sink) {
Some(())
} else {
None
}
}
}
fn entry(
&mut self,
id: u64,
dict: u16,
coords: &[i16],
scale: f32,
glyph: &Glyph,
) -> &HinterState {
let epoch = self.epoch;
let (found, index) = self.find_entry(id, dict, coords, scale);
if found {
let entry = &mut self.entries[index];
entry.epoch = epoch;
&entry.state
} else {
self.epoch += 1;
let state = HinterState::new(glyph, scale, coords);
if index == self.entries.len() {
self.entries.push(Entry {
epoch,
id,
dict,
state,
coords: Vec::from(coords),
scale,
});
&self.entries[index].state
} else {
let entry = &mut self.entries[index];
entry.epoch = epoch;
entry.id = id;
entry.dict = dict;
entry.state = state;
entry.coords.clear();
entry.coords.extend_from_slice(coords);
entry.scale = scale;
&entry.state
}
}
}
fn find_entry(&self, id: u64, dict: u16, coords: &[i16], scale: f32) -> (bool, usize) {
let mut lowest_epoch = self.epoch;
let mut lowest_index = 0;
let vary = coords.len() != 0;
for (i, entry) in self.entries.iter().enumerate() {
if entry.id == id
&& entry.dict == dict
&& entry.scale == scale
&& (!vary || (coords == &entry.coords[..]))
{
return (true, i);
}
if entry.epoch < lowest_epoch {
lowest_epoch = entry.epoch;
lowest_index = i;
}
}
if self.entries.len() < self.max_entries {
lowest_index = self.entries.len();
}
(false, lowest_index)
}
}
struct Entry {
epoch: u64,
id: u64,
dict: u16,
state: HinterState,
coords: Vec<i16>,
scale: f32,
}