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add color multiplication via operator overload for ARGBu8x4

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of course, here we immediately must question whether this is abuse
of operator overloading or not. since you cannot otherwise multiply
these types together, i think this is fine. plus we are not providing
any other math operations via operator overloading, so this feels like
a very explicit thing to do
This commit is contained in:
Gered 2023-04-30 16:37:27 -04:00
parent 9ba65a9e37
commit 0112e99fc7
1 changed files with 39 additions and 0 deletions
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39
ggdt/src/graphics/color.rs
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@ -1,3 +1,4 @@
use std::ops::{Mul, MulAssign};
use std::simd;
/// Packed 32-bit color, in the format: 0xAARRGGBB
@ -608,6 +609,23 @@ impl ARGBu8x4 {
pub const fn to_array(&self) -> [u8; 4] {
self.0.to_array()
}
}
impl Mul for ARGBu8x4 {
type Output = ARGBu8x4;
#[inline]
fn mul(self, rhs: Self) -> Self::Output {
ARGBu8x4(((self.0.cast::<u32>() * rhs.0.cast::<u32>()) / simd::u32x4::splat(255)).cast())
}
}
impl MulAssign for ARGBu8x4 {
#[inline]
fn mul_assign(&mut self, rhs: Self) {
self.0 = ((self.0.cast::<u32>() * rhs.0.cast::<u32>()) / simd::u32x4::splat(255)).cast()
}
}
impl From<u32> for ARGBu8x4 {
@ -884,6 +902,27 @@ mod tests {
assert_eq!(color.to_array(), [0x7f, 0x19, 0x33, 0x4c]);
}
#[test]
fn argbu8x4_multiplication() {
assert_eq!([0xff, 0x11, 0x22, 0x33], (ARGBu8x4::from(0xffffffff) * ARGBu8x4::from(0xff112233)).to_array());
assert_eq!([0xff, 0x11, 0x22, 0x33], (ARGBu8x4::from(0xff112233) * ARGBu8x4::from(0xffffffff)).to_array());
assert_eq!([0x7f, 0x03, 0x00, 0x14], (ARGBu8x4::from(0x7f330066) * ARGBu8x4::from(0xff112233)).to_array());
assert_eq!([0x7f, 0x03, 0x00, 0x14], (ARGBu8x4::from(0xff112233) * ARGBu8x4::from(0x7f330066)).to_array());
let mut color = ARGBu8x4::from(0xffffffff);
color *= ARGBu8x4::from(0xff112233);
assert_eq!([0xff, 0x11, 0x22, 0x33], color.to_array());
let mut color = ARGBu8x4::from(0xff112233);
color *= ARGBu8x4::from(0xffffffff);
assert_eq!([0xff, 0x11, 0x22, 0x33], color.to_array());
let mut color = ARGBu8x4::from(0x7f330066);
color *= ARGBu8x4::from(0xff112233);
assert_eq!([0x7f, 0x03, 0x00, 0x14], color.to_array());
let mut color = ARGBu8x4::from(0xff112233);
color *= ARGBu8x4::from(0x7f330066);
assert_eq!([0x7f, 0x03, 0x00, 0x14], color.to_array());
}
#[test]
fn argbf32x4() {
let mut color = ARGBf32x4(simd::f32x4::from_array([0.5, 0.1, 0.2, 0.3]));