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//! The elements layouts are composed of.
use std::fmt::{self, Debug, Formatter};
use ttf_parser::GlyphId;
use fontdock::FaceId;
use crate::geom::Size;
/// A sequence of positioned layout elements.
#[derive(Debug, Clone, PartialEq)]
pub struct LayoutElements(pub Vec<(Size, LayoutElement)>);
impl LayoutElements {
/// Create an empty sequence.
pub fn new() -> Self {
LayoutElements(vec![])
}
/// Add an element at a position.
pub fn push(&mut self, pos: Size, element: LayoutElement) {
self.0.push((pos, element));
}
/// Add a sequence of elements offset by an `offset`.
pub fn extend_offset(&mut self, offset: Size, more: Self) {
for (subpos, element) in more.0 {
self.0.push((subpos + offset, element));
}
}
}
impl Default for LayoutElements {
fn default() -> Self {
Self::new()
}
}
/// A layout element, which is the basic building block layouts are composed of.
#[derive(Debug, Clone, PartialEq)]
pub enum LayoutElement {
/// Shaped text.
Text(Shaped),
}
/// A shaped run of text.
#[derive(Clone, PartialEq)]
pub struct Shaped {
pub text: String,
pub face: FaceId,
pub glyphs: Vec<GlyphId>,
pub offsets: Vec<f64>,
pub size: f64,
}
impl Shaped {
/// Create an empty shape run.
pub fn new(face: FaceId, size: f64) -> Shaped {
Shaped {
text: String::new(),
face,
glyphs: vec![],
offsets: vec![],
size,
}
}
/// Encode the glyph ids into a big-endian byte buffer.
pub fn encode_glyphs(&self) -> Vec<u8> {
const BYTES_PER_GLYPH: usize = 2;
let mut bytes = Vec::with_capacity(BYTES_PER_GLYPH * self.glyphs.len());
for g in &self.glyphs {
bytes.push((g.0 >> 8) as u8);
bytes.push((g.0 & 0xff) as u8);
}
bytes
}
}
impl Debug for Shaped {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
write!(f, "Shaped({})", self.text)
}
}
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