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use crate::{frame::Frame, pixel::Pixel};
use std::ops::Index;
pub struct View<'a> {
pub frame: &'a Frame,
pub offset: (usize, usize),
pub size: (usize, usize),
}
impl<'a> View<'a> {
pub fn new(frame: &'a Frame, offset: (usize, usize), size: (usize, usize)) -> Self {
Self {
frame,
offset,
size,
}
}
pub fn diff(va: &Self, vb: &Self) -> f64 {
assert_eq!(va.size, vb.size);
let mut acc = 0.0;
for x in 0..va.size.0 {
for y in 0..va.size.1 {
let a = va[(x, y)];
let b = vb[(x, y)];
acc += Pixel::distance(a, b);
}
}
acc
}
pub fn split(&self) -> [Self; 2] {
let vert = self.size.0 > self.size.1;
[
Self {
frame: self.frame,
offset: self.offset,
size: if vert {
(self.size.0 / 2, self.size.1)
} else {
(self.size.0, self.size.1 / 2)
},
},
Self {
frame: self.frame,
offset: if vert {
(self.offset.0 + self.size.0 / 2, self.offset.1)
} else {
(self.offset.0, self.offset.1 + self.size.1 / 2)
},
size: if vert {
(self.size.0 - self.size.0 / 2, self.size.1)
} else {
(self.size.0, self.size.1 - self.size.1 / 2)
},
},
]
}
pub fn pixels(&self) -> Vec<Pixel> {
let mut v = vec![];
for x in 0..self.size.0 {
for y in 0..self.size.1 {
v.push(self[(x, y)]);
}
}
v
}
}
impl Index<(usize, usize)> for View<'_> {
type Output = Pixel;
#[inline]
fn index(&self, (x, y): (usize, usize)) -> &Self::Output {
&self.frame[(x + self.offset.0, y + self.offset.1)]
}
}
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