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pub trait Internal: Copy + Clone + PartialEq + std::ops::Sub<Output = Self> {
const MIN: Self;
const MAX: Self;
fn clamp(self) -> Self;
fn as_u8(self) -> u8;
fn as_f32(self) -> f32;
fn as_f64(self) -> f64;
fn mul_u8(self, value: u8) -> u8;
fn mul_u16(self, value: u16) -> u16;
fn mul_u32(self, value: u32) -> u32;
fn mul_f32(self, value: f32) -> f32;
fn mul_f64(self, value: f64) -> f64;
}
impl Internal for u8 {
const MIN: Self = u8::MIN;
const MAX: Self = u8::MAX;
fn clamp(self) -> Self {
self
}
fn as_u8(self) -> u8 {
self
}
fn as_f32(self) -> f32 {
self as f32 / u8::MAX as f32
}
fn as_f64(self) -> f64 {
self as f64 / u8::MAX as f64
}
fn mul_u8(self, value: u8) -> u8 {
(value as u16 * self as u16 / 255u16) as u8
}
fn mul_u16(self, value: u16) -> u16 {
(value as u32 * self as u32 / 255u32) as u16
}
fn mul_u32(self, value: u32) -> u32 {
(value as u64 * self as u64 / 255u64) as u32
}
fn mul_f32(self, value: f32) -> f32 {
value * self.as_f32()
}
fn mul_f64(self, value: f64) -> f64 {
value * self.as_f64()
}
}
macro_rules! impl_for_float {
($type:ty) => {
impl Internal for $type {
const MIN: Self = 0.0;
const MAX: Self = 1.0;
fn clamp(self) -> Self {
<$type>::clamp(self, <Self as Internal>::MIN, <Self as Internal>::MAX)
}
fn as_u8(self) -> u8 {
(self * 255.0) as u8
}
fn as_f32(self) -> f32 {
self as f32
}
fn as_f64(self) -> f64 {
self as f64
}
fn mul_u8(self, value: u8) -> u8 {
(value as Self * self) as u8
}
fn mul_u16(self, value: u16) -> u16 {
(value as Self * self).round() as u16
}
fn mul_u32(self, value: u32) -> u32 {
(value as Self * self).round() as u32
}
fn mul_f32(self, value: f32) -> f32 {
value * self.as_f32()
}
fn mul_f64(self, value: f64) -> f64 {
value * self.as_f64()
}
}
};
}
impl_for_float!(f32);
impl_for_float!(f64);
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