3af6a69f1e
Instead of CSSColorValue holding a Gfx::Color, make it an abstract class with subclasses for each different color function, to match the Typed-OM spec. This means moving the color calculations from the parsing code to the `to_color()` method on the style value. This lets us have calc() inside a color function, instead of having to fully resolve the color at parse time. The canvas fillStyle tests have been updated to reflect this. The other test change is Screenshot/css-color-functions.html: previously we produced slightly different colors for an alpha of 0.5 and one of 50%, and this incorrect behavior was baked into the test. So now it's more correct. :^)
77 lines
2.6 KiB
C++
77 lines
2.6 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/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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Color CSSRGB::to_color(Optional<Layout::NodeWithStyle const&>) const
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{
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auto resolve_rgb_to_u8 = [](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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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() * 2.55);
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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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return normalized(calculated.resolve_number().value());
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if (calculated.resolves_to_percentage())
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return normalized(calculated.resolve_percentage().value().value() * 2.55);
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}
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if (style_value.is_keyword() && style_value.to_keyword() == Keyword::None)
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return 0;
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return {};
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};
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auto resolve_alpha_to_u8 = [](CSSStyleValue const& style_value) -> Optional<u8> {
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auto alpha_0_1 = resolve_alpha(style_value);
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if (alpha_0_1.has_value())
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return llround(clamp(alpha_0_1.value() * 255.0, 0.0, 255.0));
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return {};
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};
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u8 const r_val = resolve_rgb_to_u8(m_properties.r).value_or(0);
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u8 const g_val = resolve_rgb_to_u8(m_properties.g).value_or(0);
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u8 const b_val = resolve_rgb_to_u8(m_properties.b).value_or(0);
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u8 const alpha_val = resolve_alpha_to_u8(m_properties.alpha).value_or(255);
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return Color(r_val, g_val, b_val, alpha_val);
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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 = verify_cast<CSSRGB>(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() const
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{
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// FIXME: Do this properly, taking unresolved calculated values into account.
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return serialize_a_srgb_value(to_color({}));
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}
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}
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