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Bug 1813014 - Add missing color conversions r=emilio

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The patch adds some of the color conversions away from sRGB.

Differential Revision: https://phabricator.services.mozilla.com/D168895
This commit is contained in:
Tiaan Louw 2023-02-05 20:42:11 +00:00
parent 60c9bb9caf
commit b87e961ca5
1 changed files with 83 additions and 35 deletions
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118
servo/components/style/color/convert.rs
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@ -8,6 +8,9 @@
//! unless otherwise specified:
//!
//! https://drafts.csswg.org/csswg-drafts/css-color-4/#color-conversion-code
//!
//! NOTE: Matrices has to be transposed from the examples in the spec for use
//! with the `euclid` library.
use crate::color::ColorComponents;
use std::f32::consts::PI;
@ -223,6 +226,14 @@ impl DisplayP3 {
0.1982172852343625, 0.079286914093745, 1.0439443689009757, 0.0,
0.0, 0.0, 0.0, 1.0,
);
#[rustfmt::skip]
const FROM_XYZ: Transform = Transform::new(
2.4934969119414245, -0.829488969561575, 0.035845830243784335, 0.0,
-0.9313836179191236, 1.7626640603183468, -0.07617238926804171, 0.0,
-0.40271078445071684, 0.02362468584194359, 0.9568845240076873, 0.0,
0.0, 0.0, 0.0, 1.0,
);
}
impl ColorSpaceConversion for DisplayP3 {
@ -236,12 +247,12 @@ impl ColorSpaceConversion for DisplayP3 {
transform(from, &Self::TO_XYZ)
}
fn from_xyz(_from: &ColorComponents) -> ColorComponents {
todo!()
fn from_xyz(from: &ColorComponents) -> ColorComponents {
transform(from, &Self::FROM_XYZ)
}
fn to_gamma_encoded(_from: &ColorComponents) -> ColorComponents {
todo!()
fn to_gamma_encoded(from: &ColorComponents) -> ColorComponents {
Srgb::to_gamma_encoded(from)
}
}
@ -257,30 +268,34 @@ impl A98Rgb {
0.18822864623499472, 0.07529145849399789, 0.9913375368376389, 0.0,
0.0, 0.0, 0.0, 1.0,
);
#[rustfmt::skip]
const FROM_XYZ: Transform = Transform::new(
2.041587903810746, -0.9692436362808798, 0.013444280632031024, 0.0,
-0.5650069742788596, 1.8759675015077206, -0.11836239223101824, 0.0,
-0.3447313507783295, 0.04155505740717561, 1.0151749943912054, 0.0,
0.0, 0.0, 0.0, 1.0,
);
}
impl ColorSpaceConversion for A98Rgb {
const WHITE_POINT: WhitePoint = WhitePoint::D65;
fn to_linear_light(from: &ColorComponents) -> ColorComponents {
#[inline]
fn map(value: f32) -> f32 {
value.signum() * value.abs().powf(2.19921875)
}
ColorComponents(map(from.0), map(from.1), map(from.2))
from.clone().map(|v| v.signum() * v.abs().powf(2.19921875))
}
fn to_xyz(from: &ColorComponents) -> ColorComponents {
transform(from, &Self::TO_XYZ)
}
fn from_xyz(_from: &ColorComponents) -> ColorComponents {
todo!()
fn from_xyz(from: &ColorComponents) -> ColorComponents {
transform(from, &Self::FROM_XYZ)
}
fn to_gamma_encoded(_from: &ColorComponents) -> ColorComponents {
todo!()
fn to_gamma_encoded(from: &ColorComponents) -> ColorComponents {
from.clone()
.map(|v| v.signum() * v.abs().powf(0.4547069271758437))
}
}
@ -296,6 +311,14 @@ impl ProphotoRgb {
0.0313493495815248, 0.00008565396060525902, 0.8251046025104601, 0.0,
0.0, 0.0, 0.0, 1.0,
);
#[rustfmt::skip]
const FROM_XYZ: Transform = Transform::new(
1.3457989731028281, -0.5446224939028347, 0.0, 0.0,
-0.25558010007997534, 1.5082327413132781, 0.0, 0.0,
-0.05110628506753401, 0.02053603239147973, 1.2119675456389454, 0.0,
0.0, 0.0, 0.0, 1.0,
);
}
impl ColorSpaceConversion for ProphotoRgb {
@ -319,12 +342,21 @@ impl ColorSpaceConversion for ProphotoRgb {
transform(from, &Self::TO_XYZ)
}
fn from_xyz(_from: &ColorComponents) -> ColorComponents {
todo!()
fn from_xyz(from: &ColorComponents) -> ColorComponents {
transform(from, &Self::FROM_XYZ)
}
fn to_gamma_encoded(_from: &ColorComponents) -> ColorComponents {
todo!()
fn to_gamma_encoded(from: &ColorComponents) -> ColorComponents {
const ET: f32 = 1.0 / 512.0;
from.clone().map(|v| {
let abs = v.abs();
if abs >= ET {
v.signum() * abs.powf(1.0 / 1.8)
} else {
16.0 * v
}
})
}
}
@ -333,6 +365,9 @@ impl ColorSpaceConversion for ProphotoRgb {
pub struct Rec2020;
impl Rec2020 {
const ALPHA: f32 = 1.09929682680944;
const BETA: f32 = 0.018053968510807;
#[rustfmt::skip]
const TO_XYZ: Transform = Transform::new(
0.6369580483012913, 0.26270021201126703, 0.0, 0.0,
@ -340,6 +375,14 @@ impl Rec2020 {
0.16888097516417205, 0.059301716469861945, 1.0609850577107909, 0.0,
0.0, 0.0, 0.0, 1.0,
);
#[rustfmt::skip]
const FROM_XYZ: Transform = Transform::new(
1.7166511879712676, -0.666684351832489, 0.017639857445310915, 0.0,
-0.3556707837763924, 1.616481236634939, -0.042770613257808655, 0.0,
-0.2533662813736598, 0.01576854581391113, 0.942103121235474, 0.0,
0.0, 0.0, 0.0, 1.0,
);
}
impl ColorSpaceConversion for Rec2020 {
@ -347,15 +390,12 @@ impl ColorSpaceConversion for Rec2020 {
fn to_linear_light(from: &ColorComponents) -> ColorComponents {
from.clone().map(|value| {
const ALPHA: f32 = 1.09929682680944;
const BETA: f32 = 0.018053968510807;
let abs = value.abs();
if abs < BETA * 4.5 {
if abs < Self::BETA * 4.5 {
value / 4.5
} else {
value.signum() * ((abs + ALPHA - 1.0) / ALPHA).powf(1.0 / 0.45)
value.signum() * ((abs + Self::ALPHA - 1.0) / Self::ALPHA).powf(1.0 / 0.45)
}
})
}
@ -364,12 +404,20 @@ impl ColorSpaceConversion for Rec2020 {
transform(from, &Self::TO_XYZ)
}
fn from_xyz(_from: &ColorComponents) -> ColorComponents {
todo!()
fn from_xyz(from: &ColorComponents) -> ColorComponents {
transform(from, &Self::FROM_XYZ)
}
fn to_gamma_encoded(_from: &ColorComponents) -> ColorComponents {
todo!()
fn to_gamma_encoded(from: &ColorComponents) -> ColorComponents {
from.clone().map(|v| {
let abs = v.abs();
if abs > Self::BETA {
v.signum() * (Self::ALPHA * abs.powf(0.45) - (Self::ALPHA - 1.0))
} else {
4.5 * v
}
})
}
}
@ -388,12 +436,12 @@ impl ColorSpaceConversion for XyzD50 {
from.clone()
}
fn from_xyz(_from: &ColorComponents) -> ColorComponents {
todo!()
fn from_xyz(from: &ColorComponents) -> ColorComponents {
from.clone()
}
fn to_gamma_encoded(_from: &ColorComponents) -> ColorComponents {
todo!()
fn to_gamma_encoded(from: &ColorComponents) -> ColorComponents {
from.clone()
}
}
@ -412,12 +460,12 @@ impl ColorSpaceConversion for XyzD65 {
from.clone()
}
fn from_xyz(_from: &ColorComponents) -> ColorComponents {
todo!()
fn from_xyz(from: &ColorComponents) -> ColorComponents {
from.clone()
}
fn to_gamma_encoded(_from: &ColorComponents) -> ColorComponents {
todo!()
fn to_gamma_encoded(from: &ColorComponents) -> ColorComponents {
from.clone()
}
}