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LibWeb/CSS: Add support for the prophoto-rgb color space in color()

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That makes us pass the following WPT tests:
 - css/css-color/prophoto-rgb-001.html
 - css/css-color/prophoto-rgb-002.html
 - css/css-color/prophoto-rgb-003.html
 - css/css-color/prophoto-rgb-004.html
 - css/css-color/prophoto-rgb-005.html
 - css/css-color/predefined-009.html
 - css/css-color/predefined-010.html
This commit is contained in:
Lucas CHOLLET 2024-11-14 22:10:16 -05:00 • committed by Andreas Kling
commit 0b9c4b8adc
Notes: github-actions[bot] 2024-11-16 09:30:50 +00:00
15 changed files with 176 additions and 1 deletions
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23
Libraries/LibGfx/Color.cpp
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@ -453,6 +453,29 @@ Color Color::from_display_p3(float r, float g, float b, float alpha)
return from_xyz65(x, y, z, alpha);
}
// https://www.w3.org/TR/css-color-4/#predefined-prophoto-rgb
Color Color::from_pro_photo_rgb(float r, float g, float b, float alpha)
{
auto to_linear = [](float c) -> float {
u8 sign = c < 0 ? -1 : 1;
float absolute = abs(c);
if (absolute <= 16. / 252)
return c / 16;
return sign * pow(c, 1.8);
};
auto linear_r = to_linear(r);
auto linear_g = to_linear(g);
auto linear_b = to_linear(b);
float x = 0.79776664 * linear_r + 0.13518130 * linear_g + 0.03134773 * linear_b;
float y = 0.28807483 * linear_r + 0.71183523 * linear_g + 0.00008994 * linear_b;
float z = 0.00000000 * linear_r + 0.00000000 * linear_g + 0.82510460 * linear_b;
return from_xyz50(x, y, z, alpha);
}
Color Color::from_xyz50(float x, float y, float z, float alpha)
{
// See commit description for these values