santui-core 0.2.7

Santui core framework — App, Plugin trait, events, config, palette
Documentation 
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/// Starfield background animation, extracted from the monolithic Santui struct.
pub(super) struct Star {
    pub(super) x: u16,
    pub(super) y: u16,
    pub(super) phase: u16,
    pub(super) mag: u8,
    pub(super) freq: u16,
    pub(super) tint: u8,
}

pub(crate) struct Starfield {
    pub(super) tick: u64,
    pub(super) stars: Vec<Star>,
}

const STAR_COUNT: usize = 88;

impl Starfield {
    pub(super) fn new() -> Self {
        let mut stars = Vec::with_capacity(STAR_COUNT);
        let mut h = 0x9e3779b97f4a7c15u64;
        for _ in 0..STAR_COUNT {
            h = h
                .wrapping_mul(0x5851f42d4c957f2d)
                .wrapping_add(0x14057b7ef767814f);
            let a = h >> 32;
            let b = h >> 16;
            let c = h;
            stars.push(Star {
                x: (a % 1009) as u16,
                y: (b % 1009) as u16,
                phase: (c % 628) as u16,
                mag: {
                    let m = ((c >> 8) & 0xff) as u8;
                    if m < 100 {
                        0
                    } else if m < 200 {
                        1
                    } else if m < 240 {
                        2
                    } else {
                        3
                    }
                },
                freq: (4 + ((c >> 12) & 0x3f)) as u16,
                tint: (c >> 20 & 0xff) as u8,
            });
        }
        Starfield { tick: 0, stars }
    }

    pub(super) fn update(&mut self) {
        self.tick = self.tick.wrapping_add(1);
    }
}