texture/
ops.rs

1//! Image operations for textures.
2
3/// Flips the image vertically.
4pub fn flip_vertical(memory: &[u8], size: [u32; 2], channels: u8) -> Vec<u8> {
5    let (width, height, channels) = (size[0] as usize, size[1] as usize,
6        channels as usize);
7    let mut res = vec![0; width * height];
8    let stride = width * channels;
9    for y in 0..height {
10        for x in 0..width {
11            for c in 0..channels {
12                res[(c + x * channels + (height - 1 - y) * stride) as usize] =
13                    memory[(c + x * channels + y * stride) as usize];
14            }
15        }
16    }
17    res
18}
19
20/// Converts from alpha to rgba8.
21pub fn alpha_to_rgba8(memory: &[u8], size: [u32; 2]) -> Vec<u8> {
22    let (width, height) = (size[0] as usize, size[1] as usize);
23    let capacity = width * height * 4;
24    let stride = width;
25    let mut res = Vec::with_capacity(capacity);
26    for y in 0..height {
27        for x in 0..width {
28            res.push(255);
29            res.push(255);
30            res.push(255);
31            res.push(memory[x + y * stride]);
32        }
33    }
34    res
35}
texture/ops.rs

texture/
ops.rs
