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add color blending for ARGBu8x4

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Gered 2023-04-30 16:57:19 -04:00
parent 448ce11dbc
commit 033081a49e
1 changed files with 53 additions and 0 deletions
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53
ggdt/src/graphics/color.rs
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@ -611,6 +611,25 @@ impl ARGBu8x4 {
}
#[inline]
fn blend_components(strength: u8, src: Self, dest: Self) -> Self {
let strength = simd::u16x4::splat(strength as u16);
let max = simd::u16x4::splat(255);
ARGBu8x4((((src.0.cast() * strength) + (dest.0.cast() * (max - strength))) / max).cast())
}
#[inline]
pub fn blend(&self, dest: Self) -> Self {
ARGBu8x4::blend_components(self.a(), *self, dest)
}
#[inline]
pub fn blend_with_alpha(&self, dest: Self, alpha: u8) -> Self {
let alpha = ((alpha as u16 * self.a() as u16) / 255) as u8;
let mut blended = ARGBu8x4::blend_components(alpha, *self, dest);
blended.set_a(alpha);
blended
}
pub fn lerp(&self, other: Self, t: f32) -> Self {
ARGBu8x4((self.0.cast() + (other.0 - self.0).cast() * simd::f32x4::splat(t)).cast())
}
@ -943,6 +962,40 @@ mod tests {
);
}
#[test]
#[rustfmt::skip]
fn argbu8x4_blending() {
// TODO: for .blend(), is this really the behaviour we want? the output value's alpha
// is blended, but the source color's alpha is what is ultimately used to control
// the blend operation. what is best here? the output RGB color looks correct at
// any rate, just not sure what the proper output alpha component *should* be in
// all cases.
assert_eq!([0xff, 0x11, 0x22, 0x33], ARGBu8x4::from(0xff112233).blend(ARGBu8x4::from(0xff555555)).to_array());
assert_eq!([0xbf, 0x33, 0x3b, 0x44], ARGBu8x4::from(0x7f112233).blend(ARGBu8x4::from(0xff555555)).to_array());
assert_eq!([0xff, 0x55, 0x55, 0x55], ARGBu8x4::from(0x00112233).blend(ARGBu8x4::from(0xff555555)).to_array());
assert_eq!([0xff, 0x11, 0x22, 0x33], ARGBu8x4::from(0xff112233).blend(ARGBu8x4::from(0x7f555555)).to_array());
assert_eq!([0x7f, 0x33, 0x3b, 0x44], ARGBu8x4::from(0x7f112233).blend(ARGBu8x4::from(0x7f555555)).to_array());
assert_eq!([0x7f, 0x55, 0x55, 0x55], ARGBu8x4::from(0x00112233).blend(ARGBu8x4::from(0x7f555555)).to_array());
assert_eq!([0xff, 0x11, 0x22, 0x33], ARGBu8x4::from(0xff112233).blend_with_alpha(ARGBu8x4::from(0xff555555), 255).to_array());
assert_eq!([0x7f, 0x33, 0x3b, 0x44], ARGBu8x4::from(0x7f112233).blend_with_alpha(ARGBu8x4::from(0xff555555), 255).to_array());
assert_eq!([0x00, 0x55, 0x55, 0x55], ARGBu8x4::from(0x00112233).blend_with_alpha(ARGBu8x4::from(0xff555555), 255).to_array());
assert_eq!([0xff, 0x11, 0x22, 0x33], ARGBu8x4::from(0xff112233).blend_with_alpha(ARGBu8x4::from(0x7f555555), 255).to_array());
assert_eq!([0x7f, 0x33, 0x3b, 0x44], ARGBu8x4::from(0x7f112233).blend_with_alpha(ARGBu8x4::from(0x7f555555), 255).to_array());
assert_eq!([0x00, 0x55, 0x55, 0x55], ARGBu8x4::from(0x00112233).blend_with_alpha(ARGBu8x4::from(0x7f555555), 255).to_array());
assert_eq!([0x80, 0x32, 0x3b, 0x43], ARGBu8x4::from(0xff112233).blend_with_alpha(ARGBu8x4::from(0xff555555), 128).to_array());
assert_eq!([0x3f, 0x44, 0x48, 0x4c], ARGBu8x4::from(0x7f112233).blend_with_alpha(ARGBu8x4::from(0xff555555), 128).to_array());
assert_eq!([0x00, 0x55, 0x55, 0x55], ARGBu8x4::from(0x00112233).blend_with_alpha(ARGBu8x4::from(0xff555555), 128).to_array());
assert_eq!([0x00, 0x55, 0x55, 0x55], ARGBu8x4::from(0xff112233).blend_with_alpha(ARGBu8x4::from(0xff555555), 0).to_array());
assert_eq!([0x00, 0x55, 0x55, 0x55], ARGBu8x4::from(0x7f112233).blend_with_alpha(ARGBu8x4::from(0xff555555), 0).to_array());
assert_eq!([0x00, 0x55, 0x55, 0x55], ARGBu8x4::from(0x00112233).blend_with_alpha(ARGBu8x4::from(0xff555555), 0).to_array());
}
#[test]
fn argbf32x4() {
let mut color = ARGBf32x4(simd::f32x4::from_array([0.5, 0.1, 0.2, 0.3]));