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LibWeb/CSS: Add support for the rec2020 color space in color()

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This color space is often used as a reference in WPT tests, having
support for it makes us pass 15 new tests:
  - css/css-color/rec2020-001.html
  - css/css-color/rec2020-002.html
  - css/css-color/rec2020-003.html
  - css/css-color/rec2020-004.html
  - css/css-color/rec2020-005.html
  - css/css-color/predefined-011.html
  - css/css-color/predefined-012.html
This commit is contained in:
Lucas CHOLLET 2024-11-14 22:43:43 -05:00 • committed by Andreas Kling
commit 63873f3809
Notes: github-actions[bot] 2024-11-16 09:30:38 +00:00
14 changed files with 170 additions and 1 deletions
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27
Libraries/LibGfx/Color.cpp
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@ -476,6 +476,33 @@ Color Color::from_pro_photo_rgb(float r, float g, float b, float alpha)
return from_xyz50(x, y, z, alpha);
}
// https://www.w3.org/TR/css-color-4/#predefined-rec2020
Color Color::from_rec2020(float r, float g, float b, float alpha)
{
auto to_linear = [](float c) -> float {
auto constexpr alpha = 1.09929682680944;
auto constexpr beta = 0.018053968510807;
u8 sign = c < 0 ? -1 : 1;
auto absolute = abs(c);
if (absolute < beta * 4.5)
return c / 4.5;
return sign * (pow((absolute + alpha - 1) / alpha, 1 / 0.45));
};
auto linear_r = to_linear(r);
auto linear_g = to_linear(g);
auto linear_b = to_linear(b);
float x = 0.63695805 * linear_r + 0.14461690 * linear_g + 0.16888098 * linear_b;
float y = 0.26270021 * linear_r + 0.67799807 * linear_g + 0.05930172 * linear_b;
float z = 0.00000000 * linear_r + 0.02807269 * linear_g + 1.06098506 * linear_b;
return from_xyz65(x, y, z, alpha);
}
Color Color::from_xyz50(float x, float y, float z, float alpha)
{
// See commit description for these values