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74 lines
2.7 KiB
C++
74 lines
2.7 KiB
C++
/*
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* Copyright (c) 2024, Sam Atkins <sam@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "CSSHWB.h"
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#include <AK/TypeCasts.h>
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#include <LibWeb/CSS/Serialize.h>
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#include <LibWeb/CSS/StyleValues/CalculatedStyleValue.h>
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#include <LibWeb/CSS/StyleValues/PercentageStyleValue.h>
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namespace Web::CSS {
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Optional<Color> CSSHWB::to_color(Optional<Layout::NodeWithStyle const&>, CalculationResolutionContext const& resolution_context) const
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{
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auto h_val = resolve_hue(m_properties.h, resolution_context);
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auto raw_w_value = resolve_with_reference_value(m_properties.w, 100.0, resolution_context);
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auto raw_b_value = resolve_with_reference_value(m_properties.b, 100.0, resolution_context);
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auto alpha_val = resolve_alpha(m_properties.alpha, resolution_context);
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if (!h_val.has_value() || !raw_w_value.has_value() || !raw_b_value.has_value() || !alpha_val.has_value())
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return {};
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auto w_val = clamp(raw_w_value.value(), 0, 100) / 100.0f;
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auto b_val = clamp(raw_b_value.value(), 0, 100) / 100.0f;
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if (w_val + b_val >= 1.0f) {
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auto to_byte = [](float value) {
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return round_to<u8>(clamp(value * 255.0f, 0.0f, 255.0f));
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};
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u8 gray = to_byte(w_val / (w_val + b_val));
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return Color(gray, gray, gray, to_byte(alpha_val.value()));
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}
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auto value = 1 - b_val;
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auto saturation = 1 - (w_val / value);
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return Color::from_hsv(h_val.value(), saturation, value).with_opacity(alpha_val.value());
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}
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bool CSSHWB::equals(CSSStyleValue const& other) const
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{
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if (type() != other.type())
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return false;
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auto const& other_color = other.as_color();
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if (color_type() != other_color.color_type())
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return false;
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auto const& other_hwb = as<CSSHWB>(other_color);
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return m_properties == other_hwb.m_properties;
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}
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// https://www.w3.org/TR/css-color-4/#serializing-sRGB-values
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String CSSHWB::to_string(SerializationMode mode) const
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{
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if (auto color = to_color({}, {}); color.has_value())
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return serialize_a_srgb_value(color.value());
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StringBuilder builder;
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builder.append("hwb("sv);
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serialize_hue_component(builder, mode, m_properties.h);
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builder.append(" "sv);
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serialize_color_component(builder, mode, m_properties.w, 100, 0);
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builder.append(" "sv);
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serialize_color_component(builder, mode, m_properties.b, 100, 0);
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if ((!m_properties.alpha->is_number() || m_properties.alpha->as_number().number() < 1) && (!m_properties.alpha->is_percentage() || m_properties.alpha->as_percentage().percentage().as_fraction() < 1)) {
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builder.append(" / "sv);
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serialize_alpha_component(builder, mode, m_properties.alpha);
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}
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builder.append(")"sv);
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return builder.to_string_without_validation();
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}
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}
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