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LibWeb/CSS: Introduce a base class for LCH-based color values

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This will be used by both CSSLCH and CSSOKLCH.
This commit is contained in:
Lucas CHOLLET 2024-10-27 20:04:18 -04:00 • committed by Andreas Kling
commit e8fc731b8c
Notes: github-actions[bot] 2024-10-28 22:38:10 +00:00
5 changed files with 38 additions and 28 deletions
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45
Userland/Libraries/LibWeb/CSS/StyleValues/CSSLCHLike.cpp Normal file
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/*
* Copyright (c) 2024, Sam Atkins <sam@ladybird.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "CSSLCHLike.h"
#include <AK/Math.h>
#include <AK/TypeCasts.h>
#include <LibWeb/CSS/Serialize.h>
#include <LibWeb/CSS/StyleValues/CSSMathValue.h>
#include <LibWeb/CSS/StyleValues/NumberStyleValue.h>
#include <LibWeb/CSS/StyleValues/PercentageStyleValue.h>
namespace Web::CSS {
bool CSSLCHLike::equals(CSSStyleValue const& other) const
{
if (type() != other.type())
return false;
auto const& other_color = other.as_color();
if (color_type() != other_color.color_type())
return false;
auto const& other_oklch_like = verify_cast<CSSLCHLike>(other_color);
return m_properties == other_oklch_like.m_properties;
}
Color CSSOKLCH::to_color(Optional<Layout::NodeWithStyle const&>) const
{
auto const l_val = clamp(resolve_with_reference_value(m_properties.l, 1.0).value_or(0), 0, 1);
auto const c_val = max(resolve_with_reference_value(m_properties.c, 0.4).value_or(0), 0);
auto const h_val = AK::to_radians(resolve_hue(m_properties.h).value_or(0));
auto const alpha_val = resolve_alpha(m_properties.alpha).value_or(1);
return Color::from_oklab(l_val, c_val * cos(h_val), c_val * sin(h_val), alpha_val);
}
// https://www.w3.org/TR/css-color-4/#serializing-oklab-oklch
String CSSOKLCH::to_string() const
{
// FIXME: Do this properly, taking unresolved calculated values into account.
return serialize_a_srgb_value(to_color({}));
}
}