1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
use crate::buffer::Buffer;
use crate::compositor::Compositor;
use crate::interpolation::Interpolation;
use crate::matrix::Matrix2d;
use crate::pixel::Pixel;
pub fn draw_image_pixel_perfect<P, BD, BS, C>(
dst: &mut BD,
src: &BS,
dst_pos: (u32, u32),
src_pos: (u32, u32),
size: (u32, u32),
compositor: &C,
) where
P: Pixel,
BD: Buffer<P>,
BS: Buffer<P>,
C: Compositor<P>,
{
for dy in 0..size.1 {
for dx in 0..size.0 {
let sx = src_pos.0 + dx;
let sy = src_pos.1 + dy;
let dst_x = dst_pos.0 + dx;
let dst_y = dst_pos.1 + dy;
let dp = dst.get_pixel_mut(dst_x, dst_y);
*dp = compositor.composite(dp, src.get_pixel(sx, sy), 1.0);
}
}
}
pub fn draw_image_transformed<P, BD, BS, C, I>(
dst: &mut BD,
src: &BS,
src_rect: (f64, f64, f64, f64),
matrix: Matrix2d,
compositor: &C,
interpolation: I,
) where
P: Pixel,
BD: Buffer<P>,
BS: Buffer<P>,
C: Compositor<P>,
I: Interpolation<P, BS>,
{
let src_size = (src_rect.2 - src_rect.0, src_rect.3 - src_rect.1);
let (left, top, right, bottom) = [
matrix.apply((0.0f64, 0.0f64)),
matrix.apply((src_size.0, 0.0f64)),
matrix.apply((0.0f64, src_size.1)),
matrix.apply((src_size.0, src_size.1)),
]
.iter()
.fold(
(std::f64::INFINITY, std::f64::INFINITY, 0.0f64, 0.0f64),
|a, b| (a.0.min(b.0), a.1.min(b.1), a.2.max(b.0), a.3.max(b.1)),
);
let inverted_matrix = matrix.inverse();
let dst_size = dst.dimensions();
for y in top.floor().max(0.0) as u32..(bottom.ceil() as u32).min(dst_size.1) {
for x in left.floor().max(0.0) as u32..(right.ceil() as u32).min(dst_size.0) {
let sp = inverted_matrix.apply((x as f64, y as f64));
let (src_x, src_y) = (sp.0.round() as i32, sp.1.round() as i32);
if 0 <= src_x && src_x < src_size.0 as i32 && 0 <= src_y && src_y < src_size.1 as i32 {
let dp = dst.get_pixel_mut(x, y);
let sp = interpolation.interpolate(src, sp.0, sp.1);
*dp = compositor.composite(dp, &sp, 1.0);
}
}
}
}