buffer_graphics_lib/
scaling.rs

1use crate::image::Image;
2
3pub(crate) fn scale_nearest_neighbor(image: &Image, x_scale: usize, y_scale: usize) -> Image {
4    let new_width = image.width() * x_scale;
5    let new_height = image.height() * y_scale;
6    let mut new_image = Image::new_blank(new_width, new_height);
7    let x_scale = 1.0 / x_scale as f32;
8    let y_scale = 1.0 / y_scale as f32;
9    for y in 0..new_height {
10        for x in 0..new_width {
11            let px = (x as f32 * x_scale).floor() as usize;
12            let py = (y as f32 * y_scale).floor() as usize;
13            new_image.set_pixel(x, y, image.get_pixel(px, py));
14        }
15    }
16    new_image
17}
18
19pub(crate) fn scale_epx(image: &Image) -> Image {
20    let new_width = image.width() * 2;
21    let new_height = image.height() * 2;
22    let mut new_image = Image::new_blank(new_width, new_height);
23    for x in 0..image.width() {
24        for y in 0..image.height() {
25            let mut p1 = image.get_pixel(x, y);
26            let mut p2 = p1;
27            let mut p3 = p1;
28            let mut p4 = p1;
29            let a = image.get_pixel(x, if y > 0 { y - 1 } else { y });
30            let c = image.get_pixel(if x > 0 { x - 1 } else { x }, y);
31            let b = image.get_pixel(if x < image.width() - 2 { x + 1 } else { x }, y);
32            let d = image.get_pixel(x, if y < image.height() - 2 { y + 1 } else { y });
33
34            if c == a && c != d && a != b {
35                p1 = a
36            }
37            if a == b && a != c && b != d {
38                p2 = b
39            }
40            if d == c && d != b && c != a {
41                p3 = c
42            }
43            if b == d && b != a && d != c {
44                p4 = d
45            }
46
47            let nx = x * 2;
48            let ny = y * 2;
49            new_image.set_pixel(nx, ny, p1);
50            new_image.set_pixel(nx + 1, ny, p2);
51            new_image.set_pixel(nx, ny + 1, p3);
52            new_image.set_pixel(nx + 1, ny + 1, p4);
53        }
54    }
55    new_image
56}
buffer_graphics_lib/scaling.rs

buffer_graphics_lib/
scaling.rs
