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use image::{ImageBuffer, Luma, LumaA, Pixel, Rgb, Rgba};
use std::{i16, u16, u8};
pub type Image<P> = ImageBuffer<P, Vec<<P as Pixel>::Subpixel>>;
pub trait HasBlack {
fn black() -> Self;
}
pub trait HasWhite {
fn white() -> Self;
}
macro_rules! impl_black_white {
($for_:ty, $min:expr, $max:expr) => {
impl HasBlack for $for_ {
fn black() -> Self {
$min
}
}
impl HasWhite for $for_ {
fn white() -> Self {
$max
}
}
};
}
impl_black_white!(Luma<u8>, Luma([u8::MIN]), Luma([u8::MAX]));
impl_black_white!(Luma<u16>, Luma([u16::MIN]), Luma([u16::MAX]));
impl_black_white!(
LumaA<u8>,
LumaA([u8::MIN, u8::MAX]),
LumaA([u8::MAX, u8::MAX])
);
impl_black_white!(
LumaA<u16>,
LumaA([u16::MIN, u16::MAX]),
LumaA([u16::MAX, u16::MAX])
);
impl_black_white!(Rgb<u8>, Rgb([u8::MIN; 3]), Rgb([u8::MAX; 3]));
impl_black_white!(Rgb<u16>, Rgb([u16::MIN; 3]), Rgb([u16::MAX; 3]));
impl_black_white!(
Rgba<u8>,
Rgba([u8::MIN, u8::MIN, u8::MIN, u8::MAX]),
Rgba([u8::MAX, u8::MAX, u8::MAX, u8::MAX])
);
impl_black_white!(
Rgba<u16>,
Rgba([u16::MIN, u16::MIN, u16::MIN, u16::MAX]),
Rgba([u16::MAX, u16::MAX, u16::MAX, u16::MAX])
);
pub trait Position {
fn x(&self) -> u32;
fn y(&self) -> u32;
}
pub trait Score {
fn score(&self) -> f32;
}
pub trait Clamp<T> {
fn clamp(x: T) -> Self;
}
macro_rules! implement_clamp {
($from:ty, $to:ty, $min:expr, $max:expr, $min_from:expr, $max_from:expr) => {
impl Clamp<$from> for $to {
fn clamp(x: $from) -> $to {
if x < $max_from as $from {
if x > $min_from as $from {
x as $to
} else {
$min
}
} else {
$max
}
}
}
};
}
macro_rules! implement_identity_clamp {
( $($t:ty),* ) => {
$(
impl Clamp<$t> for $t {
fn clamp(x: $t) -> $t { x }
}
)*
};
}
implement_clamp!(i16, u8, u8::MIN, u8::MAX, u8::MIN as i16, u8::MAX as i16);
implement_clamp!(u16, u8, u8::MIN, u8::MAX, u8::MIN as u16, u8::MAX as u16);
implement_clamp!(i32, u8, u8::MIN, u8::MAX, u8::MIN as i32, u8::MAX as i32);
implement_clamp!(u32, u8, u8::MIN, u8::MAX, u8::MIN as u32, u8::MAX as u32);
implement_clamp!(f32, u8, u8::MIN, u8::MAX, u8::MIN as f32, u8::MAX as f32);
implement_clamp!(f64, u8, u8::MIN, u8::MAX, u8::MIN as f64, u8::MAX as f64);
implement_clamp!(
i32,
u16,
u16::MIN,
u16::MAX,
u16::MIN as i32,
u16::MAX as i32
);
implement_clamp!(
f32,
u16,
u16::MIN,
u16::MAX,
u16::MIN as f32,
u16::MAX as f32
);
implement_clamp!(
f64,
u16,
u16::MIN,
u16::MAX,
u16::MIN as f64,
u16::MAX as f64
);
implement_clamp!(
i32,
i16,
i16::MIN,
i16::MAX,
i16::MIN as i32,
i16::MAX as i32
);
implement_identity_clamp!(u8, i8, u16, i16, u32, i32, u64, i64, f32, f64);
#[cfg(test)]
mod tests {
use super::Clamp;
#[test]
fn test_clamp_f32_u8() {
let t: u8 = Clamp::clamp(255f32);
assert_eq!(t, 255u8);
let u: u8 = Clamp::clamp(300f32);
assert_eq!(u, 255u8);
let v: u8 = Clamp::clamp(0f32);
assert_eq!(v, 0u8);
let w: u8 = Clamp::clamp(-5f32);
assert_eq!(w, 0u8);
}
#[test]
fn test_clamp_f32_u16() {
let t: u16 = Clamp::clamp(65535f32);
assert_eq!(t, 65535u16);
let u: u16 = Clamp::clamp(300000f32);
assert_eq!(u, 65535u16);
let v: u16 = Clamp::clamp(0f32);
assert_eq!(v, 0u16);
let w: u16 = Clamp::clamp(-5f32);
assert_eq!(w, 0u16);
}
}