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|
//! Frontiers on which to place pixels.
pub mod image;
pub mod mean;
pub mod min;
use crate::color::Rgb8;
use crate::soft::SoftDelete;
use acap::coords::Coordinates;
use acap::distance::{Proximity, Metric};
use std::cell::Cell;
use std::ops::Deref;
use std::rc::Rc;
/// 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> 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);
}
}
/// A reference-counted pixel, to work around the coherence rules.
#[derive(Clone, Debug)]
struct RcPixel<C>(Rc<Pixel<C>>);
impl<C> RcPixel<C> {
fn new(x: u32, y: u32, color: C) -> Self {
Self(Rc::new(Pixel::new(x, y, color)))
}
}
impl<C> Deref for RcPixel<C> {
type Target = Pixel<C>;
fn deref(&self) -> &Self::Target {
self.0.deref()
}
}
/// A search target, to work around the coherence rules.
#[derive(Debug)]
struct Target<C>(C);
impl<C: Proximity> Proximity<Pixel<C>> for Target<C> {
type Distance = C::Distance;
fn distance(&self, other: &Pixel<C>) -> Self::Distance {
self.0.distance(&other.color)
}
}
impl<C: Metric> Metric<Pixel<C>> for Target<C> {}
impl<C: Proximity> Proximity for Pixel<C> {
type Distance = C::Distance;
fn distance(&self, other: &Pixel<C>) -> Self::Distance {
self.color.distance(&other.color)
}
}
impl<C: Metric> Metric for Pixel<C> {}
impl<C: Coordinates> Coordinates for Pixel<C> {
type Value = C::Value;
fn dims(&self) -> usize {
self.color.dims()
}
fn coord(&self, i: usize) -> Self::Value {
self.color.coord(i)
}
}
impl<C> SoftDelete for Pixel<C> {
fn is_deleted(&self) -> bool {
self.deleted.get()
}
}
impl<C: Proximity> Proximity<RcPixel<C>> for Target<C> {
type Distance = C::Distance;
fn distance(&self, other: &RcPixel<C>) -> Self::Distance {
self.0.distance(&other.0.color)
}
}
impl<C: Metric> Metric<RcPixel<C>> for Target<C> {}
impl<C: Coordinates> Coordinates for Target<C> {
type Value = C::Value;
fn dims(&self) -> usize {
self.0.dims()
}
fn coord(&self, i: usize) -> Self::Value {
self.0.coord(i)
}
}
impl<C: Proximity> Proximity for RcPixel<C> {
type Distance = C::Distance;
fn distance(&self, other: &Self) -> Self::Distance {
(*self.0).distance(&*other.0)
}
}
impl<C: Metric> Metric for RcPixel<C> {}
impl<C: Coordinates> Coordinates for RcPixel<C> {
type Value = C::Value;
fn dims(&self) -> usize {
(*self.0).dims()
}
fn coord(&self, i: usize) -> Self::Value {
(*self.0).coord(i)
}
}
impl<C> SoftDelete for RcPixel<C> {
fn is_deleted(&self) -> bool {
(*self.0).is_deleted()
}
}
/// Return all the neighbors of a pixel location.
fn neighbors(x: u32, y: u32) -> [(u32, u32); 8] {
let xm1 = x.wrapping_sub(1);
let ym1 = y.wrapping_sub(1);
let xp1 = x + 1;
let yp1 = y + 1;
[
(xm1, ym1),
(xm1, y),
(xm1, yp1),
(x, ym1),
(x, yp1),
(xp1, ym1),
(xp1, y),
(xp1, yp1),
]
}
|
