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//! Frontiers on which to place pixels.
pub mod image;
use crate::color::{ColorSpace, Rgb8};
use crate::metric::kd::Cartesian;
use crate::metric::soft::SoftDelete;
use crate::metric::Metric;
use std::cell::Cell;
/// A frontier of pixels.
pub trait Frontier {
/// The width of the image.
fn width(&self) -> u32;
/// The height of the image.
fn height(&self) -> u32;
/// The number of pixels currently on the frontier.
fn len(&self) -> usize;
/// Place the given color on the frontier, and return its position.
fn place(&mut self, rgb8: Rgb8) -> Option<(u32, u32)>;
}
/// A pixel on a frontier.
#[derive(Debug)]
struct Pixel<C> {
pos: (u32, u32),
color: C,
deleted: Cell<bool>,
}
impl<C: ColorSpace> Pixel<C> {
fn new(x: u32, y: u32, color: C) -> Self {
Self {
pos: (x, y),
color,
deleted: Cell::new(false),
}
}
fn delete(&self) {
self.deleted.set(true);
}
}
impl<C: Metric> Metric<Pixel<C>> for C {
type Distance = C::Distance;
fn distance(&self, other: &Pixel<C>) -> Self::Distance {
self.distance(&other.color)
}
}
impl<C: Metric<[f64]>> Metric<[f64]> for Pixel<C> {
type Distance = C::Distance;
fn distance(&self, other: &[f64]) -> Self::Distance {
self.color.distance(other)
}
}
impl<C: Metric> Metric for Pixel<C> {
type Distance = C::Distance;
fn distance(&self, other: &Pixel<C>) -> Self::Distance {
self.color.distance(&other.color)
}
}
impl<C: Cartesian> Cartesian for Pixel<C> {
fn dimensions(&self) -> usize {
self.color.dimensions()
}
fn coordinate(&self, i: usize) -> f64 {
self.color.coordinate(i)
}
}
impl<C> SoftDelete for Pixel<C> {
fn is_deleted(&self) -> bool {
self.deleted.get()
}
}
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