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use image::{GenericImageView, ImageBuffer, Pixel};
pub use crate::carved::Carved;
use crate::energy::energy_fn;
use crate::pos::Pos;
pub use crate::rotated::Rotated;
use crate::seam_finder::SeamFinder;
mod carved;
mod energy;
mod matrix;
mod pos;
mod rotated;
mod seam_finder;
pub fn resize<IMG: GenericImageView>(
img: &IMG,
width: u32,
height: u32,
) -> ImageBuffer<IMG::Pixel, Vec<<<IMG as GenericImageView>::Pixel as Pixel>::Subpixel>>
where
<IMG as GenericImageView>::Pixel: 'static,
{
let Pos(to_remove_x, to_remove_y) = max_pos(img) - Pos(width, height);
let carved_x = carve(img, to_remove_x);
let rotated = Rotated(&carved_x);
let carved_y = carve(&rotated, to_remove_y);
let re_rotated = Rotated(&carved_y);
image_view_to_buffer(&re_rotated)
}
fn max_pos<IMG: GenericImageView>(img: &IMG) -> Pos {
Pos(img.width(), img.height())
}
pub struct Carvable<'a, IMG: GenericImageView>
where
<IMG as GenericImageView>::Pixel: 'a,
{
carved: Carved<'a, IMG>,
seam_finder: SeamFinder,
}
impl<'a, IMG: GenericImageView> Carvable<'a, IMG> {
pub fn new(img: &'a IMG) -> Self {
let carved = Carved::new(img);
let seam_finder = SeamFinder::new(max_pos(img));
Carvable {
carved,
seam_finder,
}
}
pub fn remove_seam(&mut self) {
let img = &self.carved;
let seam = self.seam_finder.extract_seam(|p| energy_fn(img, p));
self.carved.remove_seam(&seam);
}
pub fn result(&self) -> &Carved<'a, IMG> {
&self.carved
}
}
pub fn image_view_to_buffer<IMG: GenericImageView>(
img: &IMG,
) -> ImageBuffer<IMG::Pixel, Vec<<<IMG as GenericImageView>::Pixel as Pixel>::Subpixel>>
where
<IMG as GenericImageView>::Pixel: 'static,
{
let (w, h) = img.dimensions();
ImageBuffer::from_fn(w, h, |x, y| img.get_pixel(x, y))
}
fn carve<IMG: GenericImageView>(img: &IMG, pixel_count: u32) -> Carved<IMG>
where
<IMG as GenericImageView>::Pixel: 'static,
{
let mut carvable = Carvable::new(img);
(0..pixel_count).for_each(|_| carvable.remove_seam());
carvable.carved
}
#[cfg(test)]
mod tests {
use image::{GrayImage, ImageBuffer, Luma};
use crate::{energy_fn, Pos};
#[test]
fn energy_fn_correct() {
let img = GrayImage::from_raw(3, 2, vec![3, 1, 4, 1, 5, 9]).unwrap();
let energy = ImageBuffer::from_fn(3, 2, |x, y| Luma([energy_fn(&img, Pos(x, y))]));
let expected = vec![
(2 * 2 + 2 * 2),
(1 * 1 + 4 * 4),
(5 * 5 + 3 * 3),
(2 * 2 + 4 * 4),
(4 * 4 + 8 * 8),
(5 * 5 + 4 * 4),
];
assert_eq!(energy.into_raw(), expected);
}
}