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111 lines
4 KiB
C++
111 lines
4 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 "CSSRGB.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/CSSKeywordValue.h>
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#include <LibWeb/CSS/StyleValues/CalculatedStyleValue.h>
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#include <LibWeb/CSS/StyleValues/NumberStyleValue.h>
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#include <LibWeb/CSS/StyleValues/PercentageStyleValue.h>
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namespace Web::CSS {
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Optional<Color> CSSRGB::to_color(Optional<Layout::NodeWithStyle const&>, CalculationResolutionContext const& resolution_context) const
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{
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auto resolve_rgb_to_u8 = [&resolution_context](CSSStyleValue const& style_value) -> Optional<u8> {
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// <number> | <percentage> | none
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auto normalized = [](double number) {
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if (isnan(number))
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number = 0;
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return llround(clamp(number, 0.0, 255.0));
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};
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if (style_value.is_number())
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return normalized(style_value.as_number().number());
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if (style_value.is_percentage())
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return normalized(style_value.as_percentage().value() * 255 / 100);
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if (style_value.is_calculated()) {
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auto const& calculated = style_value.as_calculated();
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if (calculated.resolves_to_number()) {
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auto maybe_number = calculated.resolve_number(resolution_context);
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if (!maybe_number.has_value())
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return {};
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return normalized(maybe_number.value());
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}
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if (calculated.resolves_to_percentage()) {
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auto maybe_percentage = calculated.resolve_percentage(resolution_context);
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if (!maybe_percentage.has_value())
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return {};
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return normalized(maybe_percentage.value().value() * 255 / 100);
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}
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}
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return 0;
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};
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auto resolve_alpha_to_u8 = [&resolution_context](CSSStyleValue const& style_value) -> Optional<u8> {
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auto alpha_0_1 = resolve_alpha(style_value, resolution_context);
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if (alpha_0_1.has_value())
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return llround(clamp(alpha_0_1.value() * 255.0f, 0.0f, 255.0f));
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return {};
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};
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auto r_val = resolve_rgb_to_u8(m_properties.r);
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auto g_val = resolve_rgb_to_u8(m_properties.g);
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auto b_val = resolve_rgb_to_u8(m_properties.b);
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auto alpha_val = resolve_alpha_to_u8(m_properties.alpha);
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if (!r_val.has_value() || !g_val.has_value() || !b_val.has_value() || !alpha_val.has_value())
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return {};
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return Color(r_val.value(), g_val.value(), b_val.value(), alpha_val.value());
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}
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bool CSSRGB::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_rgb = static_cast<CSSRGB const&>(other_color);
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return m_properties == other_rgb.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 CSSRGB::to_string(SerializationMode mode) const
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{
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if (mode != SerializationMode::ResolvedValue && m_properties.name.has_value())
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return m_properties.name.value().to_string().to_ascii_lowercase();
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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("rgb("sv);
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serialize_color_component(builder, mode, m_properties.r, 255, 0, 255);
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builder.append(" "sv);
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serialize_color_component(builder, mode, m_properties.g, 255, 0, 255);
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builder.append(" "sv);
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serialize_color_component(builder, mode, m_properties.b, 255, 0, 255);
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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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