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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. :^)
54 lines
2 KiB
C++
54 lines
2 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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#pragma once
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#include <LibWeb/CSS/StyleValues/CSSColorValue.h>
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#include <LibWeb/CSS/StyleValues/NumberStyleValue.h>
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namespace Web::CSS {
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// https://drafts.css-houdini.org/css-typed-om-1/#cssrgb
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class CSSRGB final : public CSSColorValue {
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public:
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static ValueComparingNonnullRefPtr<CSSRGB> create(ValueComparingNonnullRefPtr<CSSStyleValue> r, ValueComparingNonnullRefPtr<CSSStyleValue> g, ValueComparingNonnullRefPtr<CSSStyleValue> b, ValueComparingRefPtr<CSSStyleValue> alpha = {})
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{
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// alpha defaults to 1
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if (!alpha)
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return adopt_ref(*new (nothrow) CSSRGB(move(r), move(g), move(b), NumberStyleValue::create(1)));
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return adopt_ref(*new (nothrow) CSSRGB(move(r), move(g), move(b), alpha.release_nonnull()));
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}
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virtual ~CSSRGB() override = default;
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CSSStyleValue const& r() const { return *m_properties.r; }
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CSSStyleValue const& g() const { return *m_properties.g; }
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CSSStyleValue const& b() const { return *m_properties.b; }
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CSSStyleValue const& alpha() const { return *m_properties.alpha; }
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virtual Color to_color(Optional<Layout::NodeWithStyle const&>) const override;
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String to_string() const override;
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virtual bool equals(CSSStyleValue const& other) const override;
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private:
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CSSRGB(ValueComparingNonnullRefPtr<CSSStyleValue> r, ValueComparingNonnullRefPtr<CSSStyleValue> g, ValueComparingNonnullRefPtr<CSSStyleValue> b, ValueComparingNonnullRefPtr<CSSStyleValue> alpha)
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: CSSColorValue(ColorType::RGB)
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, m_properties { .r = move(r), .g = move(g), .b = move(b), .alpha = move(alpha) }
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{
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}
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struct Properties {
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ValueComparingNonnullRefPtr<CSSStyleValue> r;
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ValueComparingNonnullRefPtr<CSSStyleValue> g;
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ValueComparingNonnullRefPtr<CSSStyleValue> b;
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ValueComparingNonnullRefPtr<CSSStyleValue> alpha;
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bool operator==(Properties const&) const = default;
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} m_properties;
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};
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}
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