vines 0.0.3

NES emulator library
Documentation 
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

const WIDTH: usize = 256;
const HEIGHT: usize = 240;
// width is multiplied by 3, because each pixel needs 3 u8 values to represent its RGB colors
const SIZE: usize = WIDTH * 3 * HEIGHT;

pub struct Frame {
    pub bytes: [u8; SIZE],
}

impl Frame {
    pub fn new() -> Self {
        Frame { bytes: [0; SIZE] }
    }

    pub fn set_pixel(&mut self, x: usize, y: usize, rgb: (u8, u8, u8)) {
        let base = y * 3 * WIDTH + x * 3;
        assert!(base + 2 < self.bytes.len());

        self.bytes[base] = rgb.0;
        self.bytes[base + 1] = rgb.1;
        self.bytes[base + 2] = rgb.2;
    }
}

#[cfg(test)]

mod test_frame {
    use super::*;

    #[test]
    fn test_frame_bytes_are_initialized_to_zero() {
        let frame = Frame::new();
        assert_eq!([0; SIZE], frame.bytes);
    }

    #[test]
    fn test_frame_bytes_size() {
        let frame = Frame::new();
        assert_eq!(256 * 3 * 240, frame.bytes.len());
    }
}